09.18: A wire has a coupq ;flxxv)and;irzs,t0. x q+5 3,ejnventional current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electr,n ,5lxuxfed;jtxq+a z).q0v3ispr; on at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describvo7fa4 it n82(n6y,zszm +a-n t2 whdtes the direction of the magnetic field7 dn-2 8f 42tzzw(svntnt,o+mhya6 ai at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currentd4s(t60fe8 xtkj7 tfe I shown. At the instant shown, what is the direction of the magnetic force on the(6te4efst87fx d0tj k electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For:gzoftxr pv--.m6s :s the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on :to:z 6r s -.smfgvxp-the proton?

  94.30: The conventional current I in afsw+(w 6xdvd*+ rab( k long straight wire flows in the upward direction as 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 t dd+k*(+awwrbv (sfx6he proton is:

  95.16: A charged particle with constant speed enters a unifcvd 4.ce+ 8*-(wjfyqdm2- ofwgi5w jrorm magnetic field whose direction is perpendicular to vc wf qmr*4dgw(o8f .eciyd+ j52w--jthe particle’s velocity. The particle will:

  98.10: A charged particle w p6x:,wkhi 4mc b:mcq 5pcg/ fcnqkve:14 +*lpith constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particl evh:, :p1l:4ckmq4*c kni+q pm6xp5cb fw/gce will

  03.34: A positively charged particle of msduy- 2p2tqwa +o)iafd6z*l,: c rep1ass M is at rest on a table. A non- zero electric field E is directed into the plane of th w2+e6cdo 2apa p1yqzi* )ut,sfldr:- e table. A non-zero magnetic field 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 w,z:lcq5il n2b uf3f vkcs84v2ith 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 direction of the electric field in this region of space? Igz 2c i5,lf8:4un2bfqkv vc l3snore gravity

  04.14: A positive electric charge of negligible weight is released from 5c5fr u+)w)no,owkch v1gf 7frest between the poles of a horseshoe magnet as shownv on k ,7 )o5+fucchfw1rg)f5w. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving i v1;0c 4pf ft rwl2f.leqqgh(rp 2e73dn 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 tha.f( ; rplwgeleprfh4270qc q v132tfdt 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 spez9o8(z m*or ud 9i-vwunb(8qt ed $1.00× 10^3\: m/s$ 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 wi:yv.. g/qll:yh f7mu musg38pth charge −e 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 the circle. What is the amount of work done by the magnetic force on the epl3.u ly g/y8:gh.m:7um fv qslectron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic field B 8l4pt: 9vu+q4l be kz-t/2v lc 3usi urs9g)rhand is dzc8-+suuvt94lsu2l)9 veip3 qhgrtb/:kr 4 l eflected 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 radius of the second ion’s path?

  16.44: A proton moves 1ir dofk0ijf/ 0jp;7zin a circular 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 fo01f0i/ ozik7pj;j rd frce 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 uyt6 r6g68n z7 x2vaxweniform magnetic field. The ions carry the same charge and have the same path radius in 7e8x6xvgyaw tn626r z the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moveu+z2g7q ; +a fdz9guz0,p vrzfaugq 0;s 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 thatdugraz7;u0a0 pgv ,gz++f;fqqu2 9z z the particle maintains a constant velocity?

  96.40: A proton of mass zp*ncf: pn/h (8ts28 /wsgxfcM and 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 e.:3) )xw omy xkza.dswlectrically charged beta particles is commonly determined b yz ).dw)msax. :okxw3y

  09.27: A proton moves stj5)sc h)-hsmd gb2-f3:cz rcd 4bee.e raight up 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 electr hebj2:dhrz 45c)-m.-3csbce g)fs d eic field? Ignore gravity.

  08.36: An electron moves in the plane of the page through twoa1cef8 9x/s tn4hr u 3u0(nzik regions 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 page (as shown). There is no electric f10 kn8ursz 4t 9enhx3 i/ucf(aield 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 velocity11lo9- ha -4lxz docvn through a region of space containdxnlz491c- l- 1hoavo ing 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 constant non-zero velocity directly between twj4xv zhg,q*8d o long straight wires. The conventional current in each wire has thj*v4z,gdh q8x e 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.