09.18: A wire has a conventional cu b*t fh:mo-i f(r2wv7xrrent 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 this tf :hb2( *m7oi-rvfwxinstant is

  14.24: For the bar magnet shown in tj:br hvyu udjf/ +8-g9he figure, which choice best describes the direction of the magnetic field at the point P located dire-jbgr v8 /hu:ydjuf+9ctly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I show:l+i ri8 cmg;i)dmopt bwt(89n. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to g it:l +otibcmm9dp(wi8 8r);the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the prjt/12k i8yh12fc iw ewoton moving toward the top of the page awt2fwh8k1 i/i1e jcy 2t the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current Iuc l5motd) 1d.3zq/56h uvohs in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At5lvdhsdz 6h 35om .co1tq)/uu 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 unifxw7/mfks c4 q1orm magnetic field whose direction is perpendicmsc x 1wf/q4k7ular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magj3a*qroq ;zi q5 )m umyx(sg 8de8n;uh msc-(9netic field whose direction is parallhae- 8d(8 uqyi(9 q;s mo3s* zcmm)xun; g5qrjel to the particle’s velocity. The particle will

  03.34: A positively cmxw5 q5 q ghvk5g.-qs6harged particle of mass M is at rest on a table. A non- zero electricwmk6qs qg ghq-5vx55. 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 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 0shgs gl46+vethat has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the ge h+v06gsls 4page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric rxize 8zfe/8pt4 mi 3.charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic3zteifmzerp8/4 x i8 . field?

  10.26: An electron moving in the48gr k-l zfbh2 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 thzg- 4kh82lbfr e 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 with sp4xbf:+ v hecr6eed $1.00× 10^3\: m/s$ 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 m1pv:m lgd rmfrl.w6cy*+et5 3ass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radm +3lyv1wm*6d .lrtfcp :5erg ius 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 time?

  97.28: An ion with charge q, mass m, and sp/gg, szqk+; s er8e)kaeed v enters a magnetic field B and is deflected into a path with a radius of curvature R. e8rqg g +esskz/a,;) kIf 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 in a circular orbio )5*xla7 nwy/ v)p8cpztrum8t in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic yc*uawtm/ )n xpv)7pr8zol85 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 perpendie t6iyu8(xj i+cular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Whi8+ (ij uxi6etych of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to txvm 2u u 0kdffmtj3*7,+u -dmuhe 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 d+tu2m7 3dmmd f jfk-x v*u,0uuirection 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 andjkzu10d9 q. sj 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 comlg7ztbn+m 6 re7hwv 2/monly determined bynrzl67 vwg /2+em7bh t

  09.27: A proton moves straight up the plane of this page into a region that.2poj7b7ffz)m uhr x 1 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 component2f1)zj7 u ohr.bfp7 mx of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two6 p7)abrr zz2ix+.v-l6 m ddkp regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field ir )+.72mrzi-x66 al zbddkppvn 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 with constant velocity through a reg((9p/ p33yasyi fafxi (kimh1 ion of space containing bp9y xa(pk(as1hm (f/yfi33ii oth 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 mobmsk2 6rhjtt 72ze) x4ves 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 tbs x2tzjt)r2 hkem 674he 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.