09.18: A wire has a conventional current I direcns dhs6(jo z:5qfq272fz8dgq ted to the right. At the instant shown in the figure, an electron has a velocity dirdos562jg2q zhzq q: 8fs (7nfdected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choob:c0. b+)l ik dn)9bia, juedice best describes the direction of the magnetic field at the point P locatea .boed9djlbin ,:0+)bciu) kd directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conv4z9 bbeqst:mf f/3m)centional current I shown. At the instant shown, what is the direction of the magnetic force on the ele )/ceqb493smf ztmb f:ctron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the lu1q+ scvv2j h7eft in a wire as shown. For the proton moving toward the sq7hu12+cjvv top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long :: 3hmjs2qja;1ak bt nstraight wire flows in the upward directioh njm qb at32:sak;j:1n 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 speed enters a uniform magnu;agub5op rvqb0(c/ q4m;uu1etic field whose direction is perpendic oqq1a b40;cuuumu /r5gv;bp(ular to the particle’s velocity. The particle will:

  98.10: A charged particle with constanwknv)z:ocb 6 q;m8(b st velocity enters a uniform magnetic field whose direction is parallel to the particle6z8q ckm( vn)bwo;:bs’s velocity. The particle will

  03.34: A positively charged particle oc,s,4pgnx *bv+jvoj0 (is+grf 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 magnetic field B i *sj+(cg v,gijonbrp 4,+vxs0s 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 weq3nf:sml gx.5cyn )-ith constant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. Th5fy n.xg3c elmsn)q-: e 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 negligib fr3t :1 ho:(:xpcp.e hx6cgrz/gdwrebp6 24rle weight is released from rest between the poles of a horseshoe magnet ewc4x :hg2or36 6f ptxz 1c:prdrg:hb(/e.p ras 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 thzqenkr41 xm ybb6i aa7e yc9r(94/7sme page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in ther7y 7meb 4q1ck9e biya 9sn6xzr/4a m( 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 mtymthijo3/. :vw p7w )oves with 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 ar(x1 kg3;sx -e(-i+ijv fh eyfnd 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 arou-vh f(13-sk+xj (ii;geer fy xnd 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 enters a magnetic fb)us5( lo. +xl*tozvfnsg 5) oield B and is deflected into a path with a radius of curvature R. If a secont*(fg +)vnuol5ls.xb5 s o)ozd 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 i b*-,8ah y-o+t ho)pvs7t ixobn a circular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit inotbv 8 oi+h* -xs)o-pt ,abhy7 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 perpendicular to the same w 5b9 txsv3yv p2e*ii9uniform magnetic field. The ions carry the same charge and have the tiwsiy vp5*992bev x3same 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. Itdrnbj , *dd6e9rhj-q*. d/ktv 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 inr-hjen*9tb. j r6qv d/d,d* kd this region so that the particle maintains a constant velocity?

  96.40: A proton of mass( d5m7 ie2okpgj(98 tf)ey w ind)i(cs M 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 electrically charged beta pabktqp :2*v(zrwg.+ nqh 8u 5tzrticles is commonly determined bbkgq p8*52z+t:r unhq w (vtz.y

  09.27: A proton moves straight up the plane of this page into a region thatkz9phs5)yz gs 5qp7z.+7wal j has a magnetic field direc+ phylqgsw5z ajp9 7 )z5s.kz7ted to the right. If the particle 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-otlaz t/9o ul3s).p.kr1kpz plane of the page through two 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 i3lt )ukp-ka9 po/ls.1z.zrtos 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 t c+/vo-e9(gzb.94 aetieg xtvelocity through a region of space containing bothte- g.c vgb+e x9ai/ e(tt9o4z 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 ber.xnmu z6x1uivb1) +g tween 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?xnr 6+b.z ig )ux11vum Any electric field in the region originates from an unseen external source.