09.18: A wire has a cm4m7ywgm e2vn,n:1xc onventional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The m47 cy, gmnwxm1: 2mnevagnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whichlhf+a0 sc*vrzwjl 2ye-- )* *dmvfc;c choice best describes the directioymcslvjwz*) hc;a2l*+-fe crfv*-d0 n of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with cn(bi*uf;g8bm*;m 7q/6osiln y oi4q.ug6xv ronventional current I shown. At the instaqxo7* 8nbvs/ .io b6mil(m4*gigufqn ;y u6 r;nt shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shoa.:+5t/z lbtkp m7bl mwn. For the proton moving toward the top of the page at the instant 7k5l:mpzt bm /.ltab+ shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long s,vz4nt:pa(xyt2fhz x ; 3hq*atraight wire flows in the upward direction as shown in the figure. (Electron flow is downward ;*2pz3 tt:vazafqnxh(y h,x4.) At the instant a proton of charge +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle wit )*)q vlmbbd0oft a,2rh constant speed enters a uniform magnetic field whose direction is perpendicular tdlbv 0 ,2a )rmf*oqb)to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a un y2yzu-.wh+5hd j tpy7iform magnetic field whose direction is parallel to the partic2 7u+hdypwy jh5t.- zyle’s velocity. The particle will

  03.34: A positively c y.pu) :e mtuqjw).c3fharged particle of mass 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 B is directed out ot q.mwf)u3ce)up .:yjf 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 velocity in a re,zgx oz w nz,a,j-hq-z7xa;fz*pu*4tgion of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page. What is the direphu-,zj,;zn- *47zt qazgo x, zx fa*wction of the electric field in this region of space? Ignore gravity

  04.14: A positive elect;hz*j gtq1hve9hv 2k7.jm*n mric charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleratnjh*g2;t jzvh mk9q v7m1. e*hion of the charge caused by the magnetic field?

  10.26: An electron moving ind4i t/dhuql x 7()zoa(l2p:w/e zd6h w the plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instant that the electron enters the magnetic field, which best describes the dui6a4ew)(t//dxq 2zdzp l: (o h7hldwirection of the resulting magnetic force on the electron?

  11.29: An electron moves with s6,f1.aj,b lrln 52e njn 1mdympeed $1.00× 10^3\: m/s$ 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 and mass m nszyt2fs 9g0vmb h 9 :lt4w(9tsfoo-0travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the electron travels halfway s m s49(bof0tyg9t0zhv2- ot9f:slnw 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,sc :tp8b/q hr mi 0(gyyog4y5( mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second p 8o4 qygy05i(sgr/(ytmhbc :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 circ 7o;hqgft+ 0ieular orbit in a uniform magnetic field B. A helium nucleus moves 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 thei7gq 0of te;h+ speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The 1-) dabpb b(. ujr-ag1)n5uizdtakh )ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for thpbu-1 tka.n 5u )brg ab)dh)(jad1i z-e two ions?

  02.15: A positively charged particle moves to ci-(b 4tgxq4owba2f(,c sg v 4the right. It enters a region of space it 4 (iw 2qx,-v(bofsb cgg4a4cn 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 that the particle maintains a constant velocity?

  96.40: A proton of mass M v(hfx83d mc+r l 9.gdgand kinetic energy $E_k$ 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 electrically charged beta particles is commonly determi);:jiogqwgaio ) 78alned by;a ) oa8l)wiojq :g7ig

  09.27: A proton moves straight up the pla,mh:s pa3ghnis g i-xf v,z8*.;,upwcne of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes throua phn p -zwgics:vixu.,,*,3h;8f mgs gh this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page 6, jaqsdx76 hxuxaq9:through two regions of space along the dotted-line trajectory shown in the figure. There is a unisx6ujhq xd: 9qx,67 aaform 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 the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity thrjhvo;mk *80cxlrccz(d 1 av,1ough a region of space containing both ack m1,c0 jv1(raolc8;xz*hvd n
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 directly betweenjhiebhq9q 5 /11r: kpa9zxmt9 two long straight wires. The conventional current in each wire has t5p1:9ab1x kier9z hj9qh/tmq he 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.