09.18: A wire has a conventional curb0,hbvufh.-u ;f )s nrrent I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force s0bn,h-ub; v .u)frfhon the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes the 5trtgis0d c9.k5dmf*direction of the magnetic f*0kdt9cm5g5. d tr isfield at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page wittwsq/d6 tqshau9rmxd:o,t ) -84 apa; h conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to tpu/4s)s;rtwm qdd-tt o6:a a9 h8q,axhe right toward the wire?

  13.30: Electrons flow to the lef/ hcn8dy mh1xa:t:c - tj14yait in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the directio8tjmhaa4 hyydn/ c1i-t xc:1: n of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in- yhp8o7.hhwf:v:n bwcd1 c v4 the upward direction ach.- h4vd y:vb:wfnp1h w 78cos shown in the figure. (Electron flow is downward.) 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 parq97if4v .ieketicle with constant speed enters a uniform magnetic field whose direction is perpendicular to the parte9kqei. i 7fv4icle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetifjg/ 3xzqi5amp+xg6dzo8 g.u3 8t q8fc field whose direction is parallel to thdq53 ix68pfg.gzt 8x g8ujoqz+/f3a me particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- ze 2p a*vbvb6tinl:vp1(ro electric field E is directed into the plane of the table. A non-zero magnetic field 1bplpa n 2*vv:vbti(6 B 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 velocity in a region of space to 0br9tn*1fkfhat has a uniform magnetic fielo9tb0kn* f1frd 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 electric charge of negligible weight is released from rest bvju 11mj5*m, n q(5 9g2j/kfcnsu hzbietween the poles m h5b jg(5 2,s19juqi /nuj*zmfnvk1 cof a horseshoe magnet as shown. 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 toqhl zk2+rp 0 eyo*q8d7 the horizontal enters a region with a constant magnetic field dir qh 8*zl0qyo2dp+7rkeected horizontally in the plane of the page as shown. At 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 spn4;3 en-0m (hml4vtx v2jz:pkz(nb b (puoh i(eed $1.00× 10^3\: m/s$ 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 travels at a speed v in ac( uc(cpmw+h. 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 around the circle. What is the amount ofcp.(cm +cwh(u work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, mass m, and spee,9z 7hi ssqa2n+prgee euj 9ng; pi :n4bu/i1;d v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are unchanged, what will be the radius2iishnnp9e7j ei/;4+zu b;9ps a:, q eg rugn1 of the second ion’s path?

  16.44: A proton moves+,tt+b i gnw,r in a circular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magneticni ,t,r b+wt+g 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 perpendicular to the same unl;4.3kewuew .n 63ceb5yul3 ttvuca. iform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same f5lla.ekvw3;.u 6b 3c 4y eetcuut.nw3or the two ions?

  02.15: A positively charged particle moves to the right. It enters a region ofj8cub,x 8y 3me 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 rejby xu83e c,8mgion so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kineticocmc2usl 94v-/v6zbj rn 9uvo0pl 6d- 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 ch,e 7x;kmihy40mlhbo )arged beta particles is commonly determined by l ;m7)yobi0hk4me,xh

  09.27: A proton moves straight up the plane of this page into a r51 zb+ m:ffmtzvl1onbs4 n (7degion that has a magnetic field directed to the right. If the particle 57fzlnv+ b 4od tf 1zb1nmm:(sis undeflected as it passes through 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 through two regions of spab2pn2v u+v+m) lm- yjtce along the dotted-line -) jv2pulnb tm +mv2+ytrajectory 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 the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves witn w(; vcur m3sr67)nibh constant velocity through a region of space containing both anr (uv)nmr; n3s 7cwb6i
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 die+ j 43wzo*e-/po8t xrjed (jyrectly between two long straight wires. 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 lo+t*e83( j-ypwojj4xeeo /d zr cation of the electron? Any electric field in the region originates from an unseen external source.