09.18: A wire has a conventional current I directed to the right. At the instanwn)kijblf f *2+fw+: y /vqz5ot shown in the figure, an electron has a veloclv iy +b5ofzff*jk w)/q +:2nwity 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 describhz q;dds81f 7res the direction of the magnetic field at the point P located directly above the cendq1df zh; s87rter of the magnet?

  11.34: A wire lies in the plane of the page with conventional current +6fjom:xx2yh*zho g.2gcx n79 8u pefI shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to thexo2g8 .oyjcfm2 *6 g x7nxf 9+:ehpuzh right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the protondq7.oe;sb bs f8y./cb moving toward the top of the page at the instant shown, what is the direction of th.8o7bbde q/ysbs c.f ;e magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows d 1kyltcpwxs/jxllt .u0 . 5k,*:g( qoin the upward directiod* 0 t..lot l5jxu(k/cqp,: 1kxlwgsyn 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 the proton is:

  95.16: A charged particle with constant speedxkrxw fl;j; q:91d+zr enters a uniform magnetic field whose direction is fw rl:kd ;rx;q j19x+zperpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unifork4bcf1u 1yc- 6oxf)wio3 isy*m magnetic field whose direction is parallel to the particle’s velocity. The )sx oo1b4ikycf*3ic16-y fwuparticle will

  03.34: A positively charged particle of mass M is ,hzg4,.k6na 0gy,afavye2qhat 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 of the plane of the table. What is true about the magnitude of the electric0a.nhy 4zg,6a,egafq,h2ky v force on the particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constamv;qnj*kf8jwg;d xzn93 ( p jus(v; c:h4q4qmnt non-zero velocity in a region of space that has a uniform magnetic field directejd8k;v:mu cv nq 4hz q3(*jj(fp;9m;q sgn4xw d 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 restg 4l +:rzgjed6q c/;kkfgbc 7so**2cq between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caz ok** 4 s:;27cgc/ ke lg6c+rqgbfqdjused by the magnetic field?

  10.26: An electron moving o*92dxwhw1f( qhv oy34) zkt din 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, whio2w h9w)h k x*ydz1otdf(vq34 ch best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves wit:b nau96n3d 8zvf9/f r gv7xoih 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 −e a-:h2vro 9x6l c nm w35mmkn3wpnd 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 9 3vmwkxlronpcm:32 6mw h5n-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, mass m, and speed v entefx3 5-b;p ns.pou0ecsrs a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, wc-ne5 x bppf0;3o.sushile m, q, and B are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit 6rupd ff15b4hp7 lvbg z6i(0hin a uniform magnetic field B. A helium nuc rbi 7dp6hpv 41hbfz(6l uf0g5leus 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 the speed of the proton?

  10.43: Two ions travel perpen1p/ d3i jnm4oxdicular to the same uniform magnetic field. The ions cao/xi 1 3mnpjd4rry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region of js)bn5u sj e3nf(tpyn7k c., 8space 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 t.e)s7p8ynknt ,3(n c jj5busfhe particle maintains a constant velocity?

  96.40: A proton of mass M (od5 b3 7i e 4ve)gqk+bdi3xjzand 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 8+wwep) al lr-beta particles is commonly determined byw)ra l-w8 +lep

  09.27: A proton moves straight up the plane of -6*ugx0)fdi97k7nyku exi bo 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 componen96uob7yeki )k0fu g -x*d7xint of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regionssijwh,)s.ym4 ylvqy2 ly v:62 of space along t6vl,2 h m.s y:wqy2 s)ly4iyvjhe 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 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 wi0 fa(xhocw m:v5t;*e6gre* tp:gc 9toth constant velocity through a region of space containing bo awctxottmvco5ferh90*g:pg(; : *e6th 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 moves9vh7wjt*hac ( wc,g. u at constant 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 ,jhv *wa uc(h7g.c t9wthe 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.