09.18: A wire has a conventional current I directed to the l oap 3eq3yq-.3c n/dulw f(2vright. At the instant shown in the figure, an electron has a velocity directed to tlql cdpv/fq- 3y3nu3.2w(eoa he left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes sclk2.dkajz0 4i.g)coo,qllk g2 4 8dthe direction of the magnetic field at the point P located directly above the cekg 8l 2g,ck.02 s4dclqka.4od i)zjlonter of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown.0 m+p2ibqgd* idxa9s+ At the instant shown, what is the direction of the magnetic force on the electron that is movini+qid9mdp2 b x0a*+s gg directly to the right toward the wire?

  13.30: Electrons flow to the le-da hnpnz9:zwn 3hemms61 v9g-g1 :eoft in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of tza s:h w69n9v:n gmzd-1-o ghe1 ep3nmhe magnetic force on the proton?

  94.30: The conventional c)2x5sne qj4mrsx);d eurrent I in a 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 th sx45) qn)esmrd2j;xee proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic fielo hh1i x*+ch+yd whose direction is perpendicular to the particle’s velocity. yhx +i1c+h*ho The particle will:

  98.10: A charged particle with constant velocity enters a uniform)mac(io vt4 d4v-l:al magnetic field whose dirdca)4(am l4v:v-olit ection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tablkzf7ff. 2w3 kde. 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 2.f3 dwkkff7z 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 ahiu u5lkkw( 3pu bd m2w7+(4bm 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 spa(3h2+d5 uibb pwuk4( lku7wmmce? Ignore gravity

  04.14: A positive electric charge f 8k/vg5x3rr;vg nb: zof negligible weight is released from rest bet/rb8vf vzx5 g:r3n;gkween the poles 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 of6 -mom8q r4sqf 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 fmms86q-q r4 othe electron enters the magnetic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron mo)8w ,6 dl89fwlcve b2pcpp4:jw xr .ctves 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 and mass m travels aacgoqj bml7:f4b0g5)l; v6net 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 amob j6 gv4af l5qmcn;e0g:l)b o7unt 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;o. r hx:(hd:j-badzp magnetic field B and is deflected 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 pato:-zdb.(jxra;: p hh dh?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A helil9kr;k tcdc::hic6- mum nucleus moves in a circular orbit in the samemc6;khci:ckl: rtd9 - 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 pey 52ka*v6i5 wzkyv97e u(ybi1h 7 lnwkrpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the fo67zb5uliyi v w *k k1ny5w9ky2 (7vheallowing quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a regi(p:iai3ccl kexrr1-z y o 27;hon of space in 7ke;(zcy1 :hlri2rap x o3ic-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 velocity?

  96.40: A proton of mass;6 fii7t h1kvqah;2rv 7t:r mw 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 electri (w2x28cxrvt( nrv(v fcally charged beta particles is commonly determined b(x8 2xt (w 2vvrrcv(fny

  09.27: A proton moves straight up the plane of thise3 /om8t)u ewxy ;sy,i page into a region that has a magnetic field directed to the right. If the particle is uy/,us3yi;w )ox8teem ndeflected 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,i 7*neh hmqc* page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I dineq**m,c hh7i rected 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 with constant . qnipr2;p)k2o78o)wdb ht gmz2 d;yzvelocity through a region of space contatm piw)d.org pyd;7 on2zq 2b); 28hzkining 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 co peae epl1n ygb.: xb8;780/l*r*hsrt5pnx genstant 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 reflects1 gel0 lx5 pyn eh:/;tb8g ne*ra8p7bx*e.srp 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.