09.18: A wire has a conventw q1(e1aqen2 mional 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 electron at ta2 1qq1een(wmhis instant is

  14.24: For the bar magnet shown in the fncy2jeha7jn(688ev4 i4trp (; iqpfj igure, which choice best describes the direction of the magnetic field at the point P located directly 2 rqjj h8iip4 4 7(fayp6c(8vnete;n jabove the center of the magnet?

  11.34: A wire lies in the plane of the page with convention ipwo k;od.*p0al current I shown. At the instant shown, what is the direction of the magneti ;.oo0kdipp* wc 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 shown. For the pr,pbjdo( tqng.-r8 :a 3yx d1dvoton moving toward the top of the page at the instant shown, what is the direction of the magnetic force o:o,8pa (tygvxndq1b 3.- drjdn the proton?

  94.30: The conventional current I in a long straight wire flows in kb+)-x oq3681z:u f2 qabhukneph l n3the upward direction as shown h+n1efzqua3kx: 8b)ou- nq l3b62phkin 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 mdnigpt7m8e9ad7 l u.6pgsj: /agnetic field whose direct: 9spi/7n dp7 m8e6.dlgau gjtion is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constnxrrvcs omf0:a0pv ,4cd-9p0ant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocirr-po49sdvamc 00 v cnfx:0 ,pty. The particle will

  03.34: A positively charged partic tdm,w ,2yr3+jpuv6 oile 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 magnetic field B is directed out of the plane of the table. What is true about the magnitude of the electric force on the parimv,d,t +yj 6uor3w2 pticle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-zero velocity in a region of sp/* +dz(d9 nko+ vbgdiface that has a uniform magnetic field directed into the plane z+* nb+/9f d vddkigo(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 igx nna2y.wv9ye3/ fo ,bmgw*+mjat3 8s released from rest between the poles of a horseshoe magnet as shown. What would be the direction of b/9j2v t3nnx ymagw,g fya e+ .*o8w3mthe acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at a lsxli87bx/r )3k ,uein 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, which best describes the direction of the resulting magnetic force on the electroi, r/7 xek8bl3xsi)u ln?

  11.29: An electron moves with t/3 vte) rt;-gz4eqiv 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 charo-oj91t dv hx+ge −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 electron in td to+ xov1h-9jhis time?

  97.28: An ion with charge q, mass m, and hepm57le2le mh)fx66 9v8pyzspeed v enters a magnetic field B and is deflected into a path with 8)l5ye2 6 exm6hh 7eplpvmz9fa 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 in5udqig h a+tyrc;kl- 6y 5,x2w a circular orbit in a uniform magnetic field B. A helium nucleus moves ;5r+uywkqlxg 6 -c, tda5yhi 2in 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 perpendicular to the same uniform magnetic-vceh n4-sr-k field. The ions carry the same charge and have the same path radius in the magnetic field. Which of h--s ve-crn4kthe following quantities must be the same for the two ions?

  02.15: A positively charged particll oe(9jf yecfb6m yrdi.,p (5o9 :*uule 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 particle maintains a constant veloc6fpj ruf.,(im 5y:ou*bee c9o9y lld( ity?

  96.40: A proton of mas;oa o3sm9zg 6is 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 particles is commonly determined bv (w4 )d kbj. t4w(ptp3gf5hns4hw n jppd54ktw )s3(t.g vf(by

  09.27: A proton moves straight up the plane of v o2o-,+t3zaxqt 4mhz*mis7hthis 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 directiomzzaho2i* q+vots ,3hx4m 7 t-n must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regi6ahb,a + nje6gons 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 fie, na +eag6jb6hld 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 through a region of sp3mjf6m k9ff 9m; ,phqqace containing botm; q9mkhf 6 fmjfq3p9,h 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-zerjda87i;97zabz:8fi c1rgq jjg3 u cd5o velocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but th9 f7zajcb:88 qgj1d5c aij d3uig;r7ze 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.