09.18: A wire has a conventionalzv tyzk7q0ws 5,3c1 ez current I directed to the right. At the instant shown in the figure, an electron has a velocity dirys5k,t0z e qc3w7v1 zzected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best deslmhz;wn5k *w- cribes the directiowkh*lm z-n;5w n of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the p jd*w kb-wv88elane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wir- bvewdk8* w8je?

  13.30: Electrons flow tzrplt 0 at81mf9y61gvo the left in a wire as shown. For the proton moving toward the top of the pagrl1 zaftvg8y961t0mp e at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a el0,d(q kmr )along straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of chargeda kerq0( )lm, +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with const61m/ky+r r 73 geaudn0)zvpuvant speed enters a uniform magnetic field whose direction is perpendiculunr g+ vz 10k6em)3a /ruyvp7dar to the particle’s velocity. The particle will:

  98.10: A charged particle wi /(d ;-n6na+s xgi45vf uwbvws7oybc0th constant velocity enters a uniform magnetic field whose direcc560v+ossyfgd uv / (;a7wi -bnb4xwn tion is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of megom -cfr(xiyk , -49rass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field Bre-r,oi9kc-gy( 4 fxm is directed out of the plane of the table. What is true about the magnitude of the electric force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero vegk :8bl ua(;dvlocity in a region of space that has a uniform magnetic fid(lv ;g ak:8bueld directed into the plane of the page. The proton moves directly up the plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electricfmu0*b9 nqzp. charge of negligible weight is released from rest between the poles of a horseshoe magnet as showf 0*9qzbnmp.un. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 fi 54)7ysqihx)a rb8 rto the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. Airq abi5sh8f)4x)7y rt the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with spet1t-p/ jsr r1zed $1.00× 10^3\: m/s$ as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of $8.00× 10^5\: m/s^2$ for the entire time of $1.00× 10^{−3}s $ that it is in the field. With what speed would the electron exit the field? Ignore gravity.

  14.29 An electron with charge −e andw3av+ zbllm e;fkgi(*n u87.n mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circularwigenu ma.v;zl +f8 (37b *nlk path of radius R. In a time t, the electron travels halfway around the circle. What is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters 8wx0t.nlh*uj jbfz8r +q/ 4-vzm 2yv ra magnetic field B and is deflected into a path with 4y8j/v zu.*h-l nrzfxj 8tb2w+vm0qr a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A hem)wz; u , 3p i)m92bxjkivkq2wlium nucleus movem,)j3ik9wpi 2 k);q2 u vmbzwxs in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendic w k(rhsl *0;psb71nkvular to the same uniform magnetic field. The ions carry the same charge and have thek1(nvr plwbh k*s7 s;0 same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enmq8mqqu5rnh:(2 eab iv4j+d 2 ters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in this region so hm4neua8md2rq( biv+5q:j q 2 that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic e33ytey/oa4iy( . tvunnergy $E_k$ passes undeflected through a region with electric
and magnetic fields perpendicular to each other. The electric field has magnitude E. The magnitude
of the magnetic field B is:

  04.25: The speed of electricallyl8qq m,lg ksw-3xhc. aq;os 5* charged beta particles is commonly determined b5-k qg,m a3hs.*qsollq c8;wx y

  09.27: A proton moves straight rkbui1l:u ri:h3k+ ):dnck w9up the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gra1iur9culk:3 :dib)k:hkr + wnvity.

  08.36: An electron moves in the plane of the page through two regions ofr 1tna u /u-4+vur7wqm space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I directed into the plane of the page (as shown). There is no electric field in Region II. What is a necessary direction of tq4a 17ru-t uwnm rv/u+he magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a rq ,f-3 y dxfx-lyeg0+ d hzrheh(3,og7egion of space containing both a hz- edhgoe0fryxqf3xyh+l 7(g,,-d 3n
electric field and a magnetic field. The electric field is directed out of the plane of the page.
Ignoring any gravitational field, which one of the following choices represents possible directions
of both the particle’s velocity and the total magnetic field in the region of space?

  15.29: An electron moves at constant non-zero velocity direct 8bg6z4g46ju tr6 *qyve kk*yu-rgrp -ly between two long straight wires8rg4gjbket*ugp 64y v-kz6r*r 6-u qy. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as shown in the figure. Ignoring gravity, which choice best reflects the direction of the magnetic field and the direction of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.