09.18: A wire has a yqva .xcesmhks82 , r1n5(fl6 conventional current I directed to the right. At the instant shown in the figure, an electron hass5l n(s6a kvhm, 81fc.eqx ry2 a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown inwh5q27llt 9 lul 7bo2vnf0: xt the figure, which choice best describes the direction of the magnetic field at the point P located directly above the center of the magnet9vw:77t ltlqf lb2h0 unolx25?

  11.34: A wire lies in the plane of the page with co44it4 ri *j;pl et6bbxnventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving direrb ej* x4t6tpi;bi4l4ctly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the pra fo)0 esdtx()c e/jj*ai,1q noton moving toward the top of the page at the instant shown, what is the direccdjo 1jitqx,a f )es)a/(n0* etion of the magnetic force on the proton?

  94.30: The conventional current I in a long sy 3)bj7y*ffge traight 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 directlgyf)j37 fy*bey toward it, the force on the proton is:

  95.16: A charged particle with constan hj*wg+k) 1vngt speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle willv1g) ghnkj*w+:

  98.10: A charged particle with constant velocity enters a uniform magnetiagmh qdd);d6ri4vo77abzc 4-c field whose direction is parallel to thzog d7)-i4a4c;rdvba mh 67 qde particle’s velocity. The particle will

  03.34: A positively charged particle of po0 66oknjixqv z0ptx3c40y 1mass 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 6vk03oct n6 1xy0p0 qz4pixjoforce 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 spa, fj / 0/vni sflred;3e,3lzalce that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the page.efr le sld3f j /zvn;i0/3a,l, 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 releasexe*4d+lp. i0g:isi ;0 zwjrwed 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 magnetic is0+*x:e0gj r;diz.4wlwei p field?

  10.26: An electron moving in the plane oft c)eh+3b6yqhgof b *3 the page at an angle of 300 to the horizontal entyg o6qcbf33 *hb)t +heers 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 electron?

  11.29: An electron moveso cq-y0l m-2 jmw*b9gdj za4p2 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 at a speed v in soe,v.6 --qfyj ocm04bt cbz3a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the 4 v qoc3ocj0f-mteszb-6 b., y 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 speed v enters a magn .p *p)w/9n ln3seakjoetic 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 radip3)9 aj lownek./*nspus of the second ion’s path?

  16.44: A proton moves in a cir2 cvadm e vgv4/p0,8qtnff,g0cular orbit 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 for/vm8dqc a,2, nf0 vtfgg vp40ece 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. The ur lyc+bj/s+d i y71*oions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the sai1jc+l/ubdo y 7s+ry* me for the two ions?

  02.15: A positively chargu yt6q8q:)v tped particle 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 rvttuq8:py)q6 egion so that the particle maintains a constant velocity?

  96.40: A proton of masgvtc: *r1rb :fvc2j8w .rm hit4c: :fgs 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 electricatff10 km2f3s uja1-dl lly charged beta particles is commonly determined byk0t1 uf-2msff 1jd l3a

  09.27: A proton moves strj3iqhwg2,w8qt8f hh f x,ic oc 1)a);uaight 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 throughu ow;afhccj)8g,h,)q8i1 qxfhw23 it this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the pl4b93x jo78 a+r -ovyvxrlpp3jane of the page through two regions of space along the dotted-line trajectory shown in the figure. Thpya8ov-9 3 +lx4v7 rjrbpx3 ojere is a uniform electric field in 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 constanj mtv6; y6*psogkv,1ut velocity through a region of space contaiu 6o1,jvmt*p ;sv6gyk ning 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 constant non-zero velocityy:e:v/*s fyhinl p5; r 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 reflects the direction of tyyre;hsv: /*:i lp f5nhe 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.