09.18: A wire has a conventional current I directed to the right. At the q mw: aupr6ol8:9gq2q instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron8q w l9rum:op6 aqg:q2 at this instant is

  14.24: For the bar magnet shokaw9 8) dlz/ ;6fqvavuwn in the figure, which choice best describes the direction of the magnetic field at the point P located directly above/zu)68wvv fak; dql a9 the center of the magnet?

  11.34: A wire lies in the plane of the eit4;g 0muh1k+s axt6page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directkst0giu+he;x4a1 t6m ly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For thc lp*zco u 7q3r0-3ov/b4xp gae proton moving towardou q7l34p* cc-0 gzva3xp r/ob the 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 straight :w :4s(k w r)e1vcd)stmwop; twire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instantsmewk; w op1 t:twr c))v(4s:d 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 fiew+26c u+yifsr4bm d+2gcr+zy g 4qm 7vld whose direction is perpendicular to the particle’s velocity. The 4g dy+s2bzmwc+7 m+y giqc2fru4+v 6r particle will:

  98.10: A charged particle with constant velocity enters a unirck qg53 k:l*low74yr*s (r8 t/ybudf form magnetic field whose direction is parallel to the partiwk/l4*cr fkbd g7yur3 s8 oqt(: r5l*ycle’s velocity. The particle will

  03.34: A positively charged particle of mass M is atzl bc7v6 zi0n5x3)a jb ,md00ovw-emb 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 on006vb0zez,obiw jd 5 x-bmvc37 )a lmn 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 4twmr r(*-yy/qj;w lwu 4 lcg8that 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 space? Ign4r lrqgmluw-8t wy (j*/4yc w;ore gravity

  04.14: A positive electric charge9 mv;mht-qdv3 ua; b;,k+elvm of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceler3qmvkm ;e+lv;-v h,bam d9 ;utation of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angya*kku(7oesj-s;1 y sle of 300 to the horizontal enters a region with a constant magnetic field directed hor1 a j k(uys7ssyke;*o-izontally 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 witn( dbri)*zm 5mh 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 at (u9tmp h*i tg+ 7r epkk :grw tb*c+)wm4.eox2a 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 this timm4e9t)7bt*wi+ g2rmw *r:h(kcuxge+ ktp. o p e?

  97.28: An ion with charge q, mass m, and spumanfb7/ 7l,leed v enters a magnetic field B and is deflected into a path with a radius of curvatnufal,7 ml/ b7ure 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 insf qo6o4v ,*tt3w1r pn 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 otnop,1rs6*wfv 34tq 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 field. Tl8)yk5wzp 2 of 2yhwar9g3gk/he ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantitpy2 5o3)ygkw/8zg ahlrkf29w ies must be the same for the two ions?

  02.15: A positively charg9ifctxc f w8-q,v;o,ned particle moves to the right. It enters a region of space in-f8qnv ,cwtcfio x,;9 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 M and kinetic ener6weo0uciu h v zg 5dzuxg2b( ,+)0y,fpkv1i: ogy $E_k$ 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:5c ks*aq0n+iwjci5u (twu7 9kse4 tb commonly determined bybtaui*5k9tj+c ks0:(cuw7i4 nsqwe5

  09.27: A proton moves tls46y xj df.*7*rwohstraight up the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes th lywh*6*7r jtx.sofd4 rough 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 through two re5x0;d eyz8i 8 ,d qqxsnw0wmz1; iz*odgions 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)di0,zyx d8q0e; ;niz 8x oqdw5mws1z*. 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 chargeepwm9y*a :5, arj.fh q moves with constant velocity through a region of space containing both 9y:m qh*pw5a,je.f aran
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 coe .obu28c xgdzlz)0m9r (,jnpnstant 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 sho,zo2gjbzrpce9 ( nl.m) dx80uwn 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.