09.18: A wire has a conventional current I directed to the right. a+l7 -k5 swongAt the instant shown in the figure, an electron has a velocity directed to the-+swloa g k5n7 left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choi2 *,8c h pb,hln,hpmvcsj 9 )ufig+ya1ce best describes the direction of the magnetic field at the point P located directly above the center of the*p1,c8ma pysi92j ), vc l,gfbn+ hhhu magnet?

  11.34: A wire lies in the plane of the page with conventional curqi 6lrgj9 ,6uhrent I shown. At th6lu,g6q rj9ihe instant 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 show;-8son(n ;:gfp5uw p.xy y rtln. For the proton moving toward the top of the page at the insta;xpy lys(;wp ot5 n-ur: f8g.nnt shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upwardni( .yz;jag8) . hlw m+5gvwut direction as shown in the figure. (Electron flow is downward.) At the instant a proton of chv.8 m5ngly(.+t; )wg wa izjhuarge +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 constant speed en; h3o4t:kn xljrqk -omjh19i.ters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle willrnqj1x. ot;4l h m i9ko:-j3kh:

  98.10: A charged particle with constant velocity enter kq(+:chr. aqbs a uniform magnetic field whose directi:k qba.h(q+ cron is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- w42y d (u/vkrwd1zs,dzero electric field E is directed into the plane of the table. A non-zero magnetic field B is directe2sk d /w1zvd, yd(rw4ud 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 wi(vrj ( 8ymeg7rth constant non-zero velocity in a region 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 dire7vjry(8g (mer ction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negl7;778 vy1oym d8kh*k7q gxmemxk:dhc igible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration hcm8o7d 7kkey1m;xm 7gx qdkh7:vy*8of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an and y j; b)e,8gdsvnm3t;gle 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 desv ; 8;yndb3,m )gtjdescribes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves wi:v.fmo 9 vc) q1g/epjh lh/.3thbx4 voth speed $1.00× 10^3\: m/s$ 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 −epl;ugfx:4uav o rkt(m :92e+ w and mass m travels 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 around to 4 p:(u;u2rwm9xa+ fv :kgelthe 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 enxk p 4v.jvsm31ters 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 unchangx41vjmvk p.3 sed, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circy0hr ct;lebi pob: . s;7)de2nular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic fielbeyh)soln:;t pr.d7e2i0 ;bc d. 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 perpendiculadysvzkm2 1p482 yb0xc r to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must b sm0 y8yvkpc2z24xd1 be the same for the two ions?

  02.15: A positively charged particle mov ;mop*j+qdqv:c (cc kna w5,/ces to the right. It enters 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 that the particle mac v ca *cn(+,;o/5wq :mqpkdcjintains a constant velocity?

  96.40: A proton of mass M and kinetic energy b.s2 v;/ .wnsyo, umfb$E_k$ 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 determincagvw3:os,eoj9em6*0b; f ; ;sgr qpded b eva;f*6gd9rgc: w,bp;o mjs0e o 3s;qy

  09.27: A proton moves straight up the plane ( o noiwgj;.ja:,b2pt of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it pass; t(nj.,g oi a2p:jwboes 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 regkodz,,t)g94/i *hod ip0w opnynsj),ions of 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 pgh) ndz4)pw* osdnokoi, y,/0,tji9page (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 thlhujzg m)x-4hb0jmhl9: mdbr v.* )7uk)(h dprough a region of space contaivh90h h-).pgbr*b u:)ld dkx huzm)jm7ljm4( ning both an
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 consta3 xyv(l *nulh)n3 m0yznt non-zero velocity directly 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 location of the electron?3v (x yyz nhnuml)0l3* Any electric field in the region originates from an unseen external source.