09.18: A wire has a conventional current I directed tomqsbpq+kg 8 9 hc5h)sw.cam5 9 the right. At the instant shown i9 s c5w.8mkm5)gapshhqqcb 9+n the figure, an electron has a velocity directed 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 descru75x ehro ffaos00j t:dr8 3p+ibes the direction of the magnetic field t+jephf:7 ofa dr08x0r3ous5 at the point P located directly above the center of the magnet?

  11.34: A wire lies in tec6lw( ujj i833fw;j, lhb)n b5 p/pnkhe plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on thpp3biul6 (j c5jlnh8/wjbew;,k)3fne electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For thq8+rj3z tvs qc,n*gsid.( g7fos 0)ebe proton moving toward the top of the page at the instant showcj3g qsoni) *b8szedst 7gf+v0q r(. ,n, 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 upwarh l1kwa:txv6v*do( n-d direction as shown in the figure. (Electron flow is downward.) Atatn(hwdv-vl: ox6 1*k 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 with constant speed enters a uniform magnetic fieldd 3a /e):zvsgt::yd ohs jrr01 whose dirh: se 3:/osgrr)zdjv1:dy 0t aection is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fie 977wwcrp h.,fu5bb2wx mql n)ld whose direction is parallel to the particle’s velocitbfnp hwcr2x7).l qwwm975,uby. The particle will

  03.34: A positively charged partyy l6e l56u-d rz,g;ziicle 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 magneti- lr5gy;duy l,6 6zziec 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 with constant non-zero velocity in a region of space that 1ca:lqklz1- 2 5kivh7.n2pn v4cejqd 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 regionjl k1a. 7nnqp4 :v5iz21-ch2 dqkevlc of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is relea0 fbz;se6 6.gotqxvc6sed from rest between the polefz6g cq06vb6x.oet ;ss of 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 aejn5uh.c-s9dl*s.,yl r2g ej5 3qe osngle of 300 to the horizo 5eg3y5.9l unojld*j ,qe h2-s.escsrntal 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 direction of the resulting magnetic force on the electron?

  11.29: An electron moves with speed4:y55ffe1 f ekd -johs $1.00× 10^3\: m/s$ 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 +:ty 1x i 1esaego9h/jub,:vyjn. mr2mass 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 electron in thhyj2r1 1:b ,g9:e tiv.y asnume/xo+jis time?

  97.28: An ion with charg;arss 5- 1)c6s rivzaxe q, 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 ion has speed 2v, while16ra-svzsr 5;ixca s ) m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton move:s(p vrsk3sdw n.-a /es in 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 force during its motion, wha k3 v:swdes(ns-.pr/ at is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the samoh:(r5( meh mbe uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Wmo r((embh:5hhich of the following quantities must be the same for the two ions?

  02.15: A positively char8k)bmn o f6f(3xl.y sfh,p(ufged particle moves 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 pa8k(omf6(),p.hu f f3fx nyl sbrticle maintains a constant velocity?

  96.40: A proton of mass M and kinetj.) d y2i-sldxbe w;00k/jfbj ic 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 pwv iwro- m.a7 x w,y1 ygyxcs+o0w l6s)kq*8,jarticles is commonly determined byk, loy6 yi) wjy7orqc 0ag8 ,*.vws+w-xm1sxw

  09.27: A proton moves stra- .(r:pggs8qrfxoy 9 p,yjiu*ight up the plane of this page into a region that has a magnetic field directed to the right. If the particle , yr98q-xupyi ggp*or.f j(s: is 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 thx z/x(1n2.hlvsb4q qayz. (bnig2+yi rough two regions of space along the dotted-line trajectory shown in the figure. There is a ub q2 vazxql((zy2n .iy1s+h4bgx/ n.iniform 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 witg0 pkp y09cu.gh constant velocity through a region of space cou g0c.09ppg kyntaining 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 veloci2b. bs qnwstf9x3a 8h d**l*vvty 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? Any electric field in the region originates from an unseb9nab q2*h*3.sxft sv*dw vl8en external source.