09.18: A wire has a conventional current I directed to the right. At the :jcqgo/t*a *c 6x gkj-wl t1f2instant shown in the figure, an electron has a velocity directed to th gg t t*:*q o/cf6xwj-kclja21e left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shk/7;g3uhz)p1suzmd g sv 70pr own in the figure, which choice best describes the direction gz p 77us)m0 z;s3 d/rhugv1pkof the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currenn hl11-vgiqfz ai-ihk43k2c/ t I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right towariig /3kiv 24h1hq1a-c l-nzfkd the wire?

  13.30: Electrons flow to the left in a :5kcfs6sku fllc g1/vg 3j /5bwire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the protogs 3/5scc:fu 5bjg/ kklv6f1 ln?

  94.30: The conventional current I in a lox xr(2 wm7hv2us4f(nmt ;d6 gzng straight wire flows in the upward direction as shown in the figuxdn (u6rw2ft s2z m(4gh xm;7vre. (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 conf by( jthj:oho)+v8h;stant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particb)fhh;tvjy+8 ( hj:oole will:

  98.10: A charged particle 9lp 4. eozwwd-with constant velocity enters a uniform magnetic field whose direction is parallel to the particlew9oz.lwp - e4d’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tableobxby-bvhk;)jh6 2p/ )p,cde. 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,b- ev ; kpjd)x)obh62cb/hyp 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 neocgvo(rv2.v )7qatj1wf. /oon-zero velocity in a region of space that has a uniform magnetic field directed2gvtcvo.jroe oa71/( q)wfv . 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? Ignore gravity

  04.14: A positive electric charge of negligible weight is released .9x frat) f2gl0isp. tfrom rest beta9 2tfft )grsi0pl..xween 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 of the page at an angbw6a/w n2ze,e hyxn92 le of 300 to the horizontal enters aehw x,e2/n2a6yz9bn w 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 electron?

  11.29: An electron moves with sprfd. m .tx:aa+eed $1.00× 10^3\: m/s$ 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 a speed v in a u,q/ln )ewyw .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 halfy.lww/, neuq)way 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 speed v entersnm +:z + 3jxim).wono6a r7zku a magnetic field B and is deflecter: n+jxm o 6u)3o.mz+ a7wknizd 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 path?

  16.44: A proton moves in a circular orbit in a unigk t9-aq8 mafo8 :ojo6form magnetic field B. A helium nucleus moves in a circular orbit in the same magn g6o:9ok8a-q oajtf 8metic 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 uniformjs(dn(7y/4d 6wfgr-f2g pi tnjhdbx 96 j ri99 magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. bn 67/ r4rx(-jhn9d 9s2fd6yd 9pjggf(t wi jiWhich of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the right.ao hisxv:i,(( It enters a region of space in which there is an electric, s a(vihx:(io 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 ener5bcz/325tsur *is 8 .gohc jkmgy $E_k$ 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 h+gbfjg9-bi, b ib-b9ghf+, jgy

  09.27: A proton moves straight up the plane of this pan6ae.il3m+ ctlqy 8i8v ;ns 7mge 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 direction must there be a component of electric field? Ignore gra; q+8i3 .s e86cnlvn7malmyi tvity.

  08.36: An electron moves in the plane oq,nd 5whz3w3y f 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 planeqy w35wn,3h dz 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 s: w6rbsw.e)hk/ud g7 through a region of space contain6bskg/) ew.rudh7 sw:ing 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 atuo(5 wwx zb. yl45rpj6k,idf0 constant non-zero velocity directly between two long straight wires. The conventionalub l, ik 54xdpro wj.0w65(fzy 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? Any electric field in the region originates from an unseen external source.