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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following arexfq2 eb.ph q5: units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction statl let dyl/*ze*ias.sz6 u5k -s 1+mz:ees that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil prodpj4.zi,r lakk aa7 47q)o:pc;lgse 5 buces what kind of change on the 7:lgk l q ,7o;az4ib.5 rkea jpcasp4)induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic fieldhvhc/;b1-zyahu c73 l through a loop of wire produces what kind of change on the ahh z/cv;-b7y3luhc1 induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kif mpy z2dj.*.xe( wkn0pp,ch+nd of change on the induced2py+*jmf ne ,h.w cp(0.pxdz k $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic 44lvjbukga892;p eqqun .tl2 field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an ind cxlpff+*ya fw;-2 c)f8bn/t xuced current in a conductor will be that which tends to produca2f lcn8cf xxw-t+;/y*fbf) pe which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table.tx .6u 3i5wl6xufa(f w A bar magnet is held above its center with its north pole point i(xx utaf66lu3.wf5w ing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is a0c2 3v emkivk50 pgl9held above its center with its north pole pointing down, and released. As it approaches the coil, the fallivl3kc5kip92ea0vm 0 gng magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a regio0prg n nd:x3uic1d 5s7n where the magnetic field vector points straight up. The magnetic field vanishes suddeig5n duxpd:r07n3c1 snly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnc-uyv8d(m u;*q a 8detetic field vector points straight up. The magnetic field suddenl (v- ;emqtd88u *ydcauy grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table topf3+n oj)m,yjbj t(a-i in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of thf( a,tijjy bm)n -3oj+e induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries a)s61vmycat5 us bk;l3 n ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of ths5 y;a)3 u s6vkclt1mbe wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire wi.n8 xq+ h*hn7m luzfv3th the north pole entering first. As the north pole enters the wire, the induced current will be (3 vxqmhz+l* 7hfnu.n8as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed aboun rwg2d;1(p vl26mmme 61w oibt an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's aon; gp mbmev(l6dr12wm1 2wi6xis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at comfn4giw y5o0 poy :8ci2-fjobn; p-,onstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop'so-4ob0if fyp j8iyn 2,mpcn-5 go:;ow axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.z /cb*.l6kbk t
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways thajy j0cw2w+bqtybgqfug m4oc7 7)0 /w4 t an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. j :oyn h*p.,b jf8fa-v The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved m+f 1*mlv i(uqnorthward at constant velocity through a magnetic field that points straight downvm1uiqf(ml *+. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocit 7bcs i;t:t2 89v)yywxjtqy* yy $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transformss+hh4: l-wg 0gm83 stjpe7xqu*4qxx y

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions eachhxebcped,6k5b xq)) c:gg /l) second. The frequency of t/,d c:qe5h6pb gblgx)e) x)kche $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device t )g*zyew.d b/e r.cyx)ss 1f)ob+g9yused to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thaq,a,l;zhu-o6aff : pzd:uwp; u7r, eat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coilwemhe1)0k(a8+he e bh contains more loops than the primary coil th kme1(8+ eh w)eebhha0en it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil cfqz6 lqc:r ; ny)e/q)montains more loops than the secondary coil then q)lzr/yc;qme 6: qfn) it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputj oae6 1jrnc)4v.ztn0,-8 p efp9mgax

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circu:: 0sn4wpd :;yvd: 4:ow+(rxkd jtnfwi nbw6pit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of c8go3 iu,xbkw,/*nyo/5wkcab onstant terminal voltage. At the moment contact is m 3/coka, i *5oyxwgw,n/b 8kbuade with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected 14 ( m /yexc*ahk0p;4.cxtq0 mfebvxfin series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery1f abxcfmxk*4hvp ;tm/ 4(0yc q0ee.x, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L+8oc*eirbd+ asgu1+ x and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resiszcw6b;g)xyaqe sf6 sv m7hb;n+zc m 6,h-4* zstance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connectib 4p6htya6- p3l xsz*vme. i;ed in series to a battery. The time constant for the circuit represents the time required for the current tom 6pbl .as6tp;3y*h-xzie4i v reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batt h527tm1ouvvnery is suddenly removed from the circuit. The time constant for of the circuit repres 7mthv5nu v12oents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the qiog rmn43(-x;eo7ab same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, t3 v:pm(skqndh f(t,eh45q9uq+ qk5 kmhe current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In n 9,pech)2fd oc/uye4mu,h;;2no fp zthis circuit, the currench, ofunz9; dcp)ye/o;2 m unepf2,h4 t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac ci) k(,egu-,x w*anmvq, axmqb-rcuit changes by what factor when the frequency is t euqa*vqx)x,wbn--k a g m,m(,ripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the A c01yqx+wnk9v C voltage across an inductor is doubled, the inductive reacvc90nk1q yw +xtance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor app )nayn.a dsafv,7 f5l.8o,oouroaches zero, the inductive reactance of thun y8l)ofdo.fao57 v,nsa. a, at coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC vj,zx0 cdor7* power supply. In this circuit, the currenvdj70o*, czrx t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancl9 p,ltecmbb1o-9tx6 e in an ac circuit changes by what factor when the frequetoecb 9p6 ,b-9xt1lm lncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of q:4er 1dd k)ivsfv)2 zthe AC voltage across a capacitor approaches zero, the capacitive4fvr)d q sv):e1 2zdki reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltavcpm0l ji0*gnx: f 0; /ybzck4ges of the inductor and capacitor in a RLC series c0 ;jzpmkgy /xfn0bc c*0v4li :ircuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of a l ydj-wxkl9 ah(3)4juvy vb.)n RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit inc9 n)bh6:-/vwy 4nwknl5arkz e reases if R increases. Whenkwb6le) h4arnn9w :v-kz5y/ n is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit in7 abb )0 gq(v*goxs,flcreases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circu j( uq6acljjnib1ga;i(llm 9a+e-30 pit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitancp rx7.2 r1llz 6o;hutbe both double in an LRC series circuit, the resonant frequencyx7rl 2uz1po6bth;r . l of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driveniqyyy5 6 e7wp1r;hlc0 by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC ;vk:3xu td-zecircuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is +oadoey4:cw tfz; vd /,s+l60- hbf hahp*v ;brotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallbv+f aeapo ;s hhl*4 d6 b+ w0v,hcyd;z:f/o-tel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotatsye j,1un s3)ning in a uniform magnetic field of 0.20 T. Find the magnetic flux through the njeuy,s1)s3nloop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20s9 m,:pgv ky6mji74s e T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field9e 7sy 6: isjkmmvpg,4 vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional ardka d x 5v tjyn/ubnlb3bne,:e:2j 8w.v95ow- ea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil ch f1v/wxy1siob2 :pp3 hgdol1.anges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wiqd aqtmol0zu: 2(qf 1q*9us s8re on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the c(8*uqmfdl29 u toq:q10 ss zaqoil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and anda5t.sx 3i/z s area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns andtl 8uk ege7kob, jy-)+ area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontal(1m bekaiopmn6js(l n8 ,t1 7aly at a location where the downward component of the Ear,nonea 7pmbi1s8mjk1(l6 t(a th's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular3k -oe gcwzolydhm( ri;8k 1-9 velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiehr9-y -3oie czkd;ml(1w8o gk ld of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator v-.ef+v+ v*(f : yvm b ec1vrueu4+grehas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of 9(oiq lwgukr6vu95+hl1 m,ll wuq-2u wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is+;bbeh f592zax4yzk b 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, whibf+2 4z95x zhkbby;each is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turnsy 9 o7c0mm: zbvz.h6mt of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC geni9 7,w 6+bbiz qpjulu:erator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avw l+qb6pz,j u:ui97 ibailable. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gener/kco wf6 syv/bzk/wrx i :wjef*:eg7(*jl1q9 ator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance eovr,lcxi .ngtf5ju:1. x 6r(of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor:(yg f 2dwauqrdhod.; s75q5t operates on 120 5dy. 5s(drq2tgqa: fh wod;u 7V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-yz a 3jsr3gpff)a ;t cii6))o0V power supply. The p3)f6t0 i)oy)acgszj;a3rif operating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6k6s4.qw jr-na:+nghl di g p74.0 W is connected to a 24-V power supply. The operating current is 1.0 Ajrn4sh6gian g:+d-7 wp4k l.q at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pogm+uz ,kj1ykn01kgp 9 o:cn3mwer supply. The operating current is 1.0 A kzcgnomm+nk93yk 0 , g:1pju1at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce af*t,6jagttu: hhg+(v primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow8p6fef vi8ca1kp cin63hu n86*v ;jdl in the secondary. How many turns are in the secondary8clpdfia u3pvkv8 *inh;j8c6 fe 61n6 ?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in r q3q:;jci;h) swg( mna 110-V primary if the 24-V secondary has 100 turns(rwn;)c q q3 :ms;hjig?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondaryt-wbj *kqkc yz;1,q+ u coil. bw-kuq q*c 1z;tykj+, If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows ina.:;gjzi d1 x b tk*z.ly.x/fgtrl7+e the primary of a transformer. Assuming 100% efficiency, how many amps at 24 +i.xabgt zg;x y e.:llrj t.zd71*kf/ V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of ta0 h9+1)ye cuml0 qfja neon sign transformer provides 7500 V at 10.0 mA. The primary coil opertq9e+ m00uy) hclja1f ates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns onhjn1 ub5rmw r:e7 x3:s its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the sexw:3jb eunr: 15 7mhsrcondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its pri(h5ltjd wq)yhyup44p973 d jfmary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present jufhpd5qlw()4 j dt3yy47h9p in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turjn;u-ntd k- 3+ ov7crwns. If thn kv;-w7u o+3j tdrc-ne input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary haayg9r2wn c6l 3s 200 turns. If the input voltage to the primary is 100 V, we can expect the oucw 2a6 nly93rgtput voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If gbq*z2 z n)jlh30s0eathe power input to the primary is 100 W, we can expect bha3 n0jl z2*0zeq )gsthe power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step :i.kiw n*)fmkped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns *.:w if mk)inkin the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppx)8 t*4ne efjna;z/vae* o0mmggq:a 9ed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost ge)en** vz t849:gn m0om;a feqaa/jxin the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tvdm) -hqn1 l2mhe voltage is usually stepped up to 4500 V by qh)nmv-dml21 a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has) oysj, o;*w pe3zc1il a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepp;o1plews*) z oiy,jc3ed up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lxyxyt -g:y2di+5r- w tz0o7gdcf/je;ong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, teiy;-g jfd2 ogxy+zdc/r :0y-t5t wx 7he voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line a6kz h:x2(ee1w.k vbl1 u/fqk vt 1000 V. How much less power would be lost if the power were tranzek:lxfqek1 6 b/w(kv uv21h.smitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generat )nrrjuzy4/a3j1u 9/csv*qxyor is 440 V at 20 A. It is to be transmitted on a line withyj*arvjqs94 z uuc/3x yrn1/) resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stl5-cn12-lzugs kv5q pored in the coil'gu2nvkq-scz 5 5-1lpls magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contqao,iw.d8 0q bpfcg5 mzt4 -/kains a 6.0-W resistor and an 18-H inductor. What is this circuit's time constantdpo/t.k q0abw8 4 -5imf qc,gz?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is u.pt(t:l a: 2y2is* gxul7is u120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet.ukt; +*ymqf ur:g;y:g What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into lq0v:c l;n9sfa 120-V AC outlet. What is the resistance of the lamp0f;9c n:lv lsq?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whatj2k4um x+x+if is the peak current through the rx+xj24kfim +uesistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powero:x.kzy8euy;;6s cdghs4 kt- dissipated in thd648u; gkess. hyx- :ykcz;ote resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rel);8k/mj8rmxpyycd4 3c cl + nsistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W hw (k* u5swl :wyo 8 ioubrbvw9v,*e*:resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W c-gm/c qwmjzu b,.q+)duqy / 8resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactanceh4yt5jbc2oh9w t rq( . of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactanc lj1ry,z1bw0;ztk jb 1e of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 1gp4+ox7j c.jkghn4 3knf6r1, lc 2iug 4.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive rea0mky3y+5ycxe * z3j,ru/j r3vu2 kpq -:nzispctance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when gdayji u+-s1 2120 V AC at a frequency of 20 kHz is applied to u ia+syg1dj-2it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current thro 92c;kczsz2glugh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF ca*38gmof 3e1p vpt*zkm pacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to2e (14fsf hexz have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of glooh5y 9+o1pt .nq;iwtb8v+1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive +b8i cw;ysi2sreactance of a 0.010-mF capacitor be 100 W?;+i82y sbswci

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current throt2wda kuemby5j;vh2hl1by -gc / c2/4 ugh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance omlkh8,:kkjskuh:s:htgc5 0/ f an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacishlhj hg5t/umc,:8 k k:skk0:tive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1nq0az2n979ct ( b c-ujr,xqwub3*r rd.0-mF capacitor are connected in seriest*9rdc3uaxwjbz9bnr2 rnq 0qu7-c, (?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and p 0i8gye+*lk e1.0-mF capa+l*e ekip8yg0 citor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whayz5m ();wrl pht is the impedar);z py5(wl hmnce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what 2gyw 9w*ist* iis the phase angle at 1000 Hy *gwwii2st*9z?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a jcu x*jr 1u,3h20-mH coil and 1.0-mF capacitor for a total impedanc,uc3j hj*urx 1e of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following 4 7 :tp9c.tpxis-onlecapacitances is needed in series with a 100-W resistor and 15-mH cpilpt49.n s7e c:o xt-oil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a 1nzzu ple6bilw)m2 5u/e gf74 total impedance of 4000ule15f lbnz p)uw2/4m ge7iz60 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series witt18r8-kh,snqy h.k q vh a 100-kW resistor at 1.0-MHz for a total inhskq1rq,h tyv 88-.k mpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wiiu8 /orhqpt.zjqhey4la+w :c d 00u3:th a 20-mF capacitor. What is the impedance at 104tl:3ap/: u+0j8.qyeidoh 0 rc uwz hq00 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor ash 1)g*soccb nk4:mx( t 1.0 kHz for a total impedance of 45 ogk1 c)s(h:bx* nc sm4W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series wi zys pvh id8/,-.v: 2dd;vpztzth a 10-mF capacitor at 1.0 kHz for a phase angle z,vp8:;tp- vdd dyh2zi .svz/ of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needea gf2l +jpr-;yd in series with a 30-W resistor at 1.0 kHz for a total impedplf-+;yj 2ga rance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is 9fige-mk*a:i9 c ixx0the phaaxxi:gf-k* 9mi9 0ice se angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1. hu, b oivqe70p9anq7c*bkbt+4re )) d0-mF capacitor are connt07qh i9k+oa n)eqbcbb eu4d r,v)p*7 ected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 07x kx*.nf,ky *xdk5dy.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the .fky*d7yx xkd x 5,nk*rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, wj4+ 7fx k.qyqa capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connect y4 f7q+wqx.jked in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for ae(1 y abd3ix*+jy6f zg series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz x*g z3+y 1afi(bedjy6 power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor 7v j 7vzq6-,iudrdrp3 mu:zb( t7ff-efor a phase angle of 7f vpe6rf:( d737 uitqdb-zur v -z,mj$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, tz.k*7 n8pldn C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving nd8l ktn*.7zpsource?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series ci0:x7 myncnki(rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reack0nm xy:7c(intance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit nli(r -n+ iqao vs3;5;fn +wjyis $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resista7c pnfhvo486wfy : /hieuqnr//h w)a5nce of 30 W. What is the power factor?na7 e ufh:/ w4ch5hyrfv8/p io/qw6n)

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circui;(5k vtjy ei9zt containing a 50-W resistor, a 10-mF yij(v95e;tz kcapacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capaciton-dp kl m8d( ty d 2byo5-q*ie)pdf(6fr and a 15-mH coil in series?d*q (ki8)pnft d-d oepylbdmfy5-2(6

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF ca57b rb8r6q84zqyh d(zl n;qndpacitor for a resonant frequencd4zn(yb6dhnr5l;bqqq r8 8z 7y of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is n,gz*v1jnar s ;sg-1qu jm,sg(eeded in series with a 3.7-mH inductor for a resonant frequency of 1000,gnuzs,sv*jmg; jqa1r- sg1( Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in sea25) :xeyodkq zqv rrj40uw) 1ries with a 30-W resistor and a 40-mH coil if the rq))o2vk0r y1:z4da5ewxrjqu esonant frequency of the circuit is to be 1000 Hz?

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