09.18: A wire has a conventional current I directegx: b +dj jrgg8xwicm26+x m,fb.:/vzd to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic for8i+/bm z,jm6 xcgbrjg .fd+::2w x xgvce on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whice/sfb5: +un7vfd1 ayzjn m:k3h choice best describes the direction of the magnetic field at the poinsn :/ jdf b mvakz13+5unefy7:t P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventionalrvhp .el.l i95 current I shown. At the instant shown, w.h 9.rilp e5lvhat is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wp yk; i(lz6+4v :gijbgire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of t kj6:p+4b(vi; ilygzg he magnetic force on the proton?

  94.30: The conventional current I inme: ep hir8fqvmp7o5vr8z92 * 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 the protq i8move2*er7 8 9p5:v rzfhmpon is:

  95.16: A charged particle withqmp,3;e p5bx s constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle wxqmp,sb3e; 5pill:

  98.10: A charged particle with constant velocity ent z wn17z+iw8gaers a uniform magnetic field whose direction is parallel to the particle’s velocity. The w7wzg18a+ni zparticle will

  03.34: A positively charged y j/0v5xwxz;qus4(l 1(vd kch,g qc4l particle of mass 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 trk(hv1lvg;l(cx,5w4dj qqx0 4ys/cu zue 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 31)esf1oeys q constant non-zero velocity in a 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 direfye3soq1 )1 esction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weig-l qa xf2rwwmct y+sti,z56of 3 r117zht is released from rest between the poles of a horseshoe magnet as shown. What wou3,ftcrz x 7tif ma2y1l5qw6w +sr z1-old 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 an0+ ,j6s7r 7aboii 19vkqq lnmi angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the pl rlb0jsna1,qqo 6i+km7 7ii9v ane 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 movesmj6y+t 1zixr,cx44 y+bqi :eb 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 d21g rag v:trh5i0 pi6go,t a1a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R.tt gig0a2ap:rh g iv ,1or561d 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 speed v en+h/ath1 h .wa; ;g02sqxenhvk ters a magnetic field B and is deflected inxvh2gs.h ; 0hkq ;n+w/eat h1ato 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 4gy01 8zmu99p d0lzi t cvx,mla uniform magnetic field B. A helium nucleus moves in a circular orbit in the same m glv,1ly ump8 xz9cti4 dz090magnetic 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 tdrk0nop db; vp0*b/u.he same uniform magnetic field. The ions carry the same charge and have the same pat /bo*npp0v;.k0ddbu rh radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle mov+* )tqj.n(m t9ysjwzveb**av es to the right. It enters a region of space in which ther.na)e*z+ mt9w *(ys jtv*qb jve 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 kineticy y :gpol/1- rvzlc 7,omb+jf, 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 commonly determineow;6xaum3.t ( 1rklffan n3 z)d b33znaftm;l)o fra unk(wx 1.6y

  09.27: A proton moves strwx*m nzqr4;rkde;7p/v n ::tnaight up the plane of this page into a region that has a magnetic field directed to theprn*::rvnn;tkz xd4/ m7w eq ; right. If the particle is undeflected 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 page through two regions of spaceca (o48/ oa9ivh5a8r fc6suu4xa:vr e 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). There is no electric field in Rsach8o cr8a6fr:v/au9iu 4voex(5 4a egion 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 constantamrbsmly b;-;83u-i py)o(xd velocity through a region of space containing bothou ms y d8x-y-lb;3irp(a;bm) 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 velocity directli1l.zkxi *u(sy between two long straight wires. The conv zi(u ik.xls1*entional 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.