09.18: A wire has a conventional current I directedwwnoxsx3a8+yk 5n6z-9q gm9j to the right. At the instant shown in the figure, an electron has a velocity direc n8w+ 6yj x3xa mqogw95-z9nksted to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure,hg,p/i 2f 73ank3tq(yv ; kt bl1ppgpm:h v6d0 which choice best describes the direction of the magnetic field at the point P located directlyvq6dl bp3t:/hphitmgp0 32af,kp17 yvg(k; n above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventir c5m3(9pb(ef ey 3xbeonal current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is movinxfb33 ep(y( cb5em e9rg directly to the right toward the wire?

  13.30: Electrons flow to the l)+*9pkb uxrq left in a wire as shown. For the proton moving toward the top of the page at the instant showqr x)u*kbl9+ pn, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a 0dp 138 fdkj7ablb uexh-,w0 slong 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 apu b0x k0 bwfd1he -j3lda78,s distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed ent:vzl .2ffql gro yjw/ -8j.i8oers a uniform magnetic field whose direction i:wj i2.f. rgvfj 8oy8oqzl/l- s perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform mau3xmuw5 4f8lignetic field whose direction is parallel to thmfu3l4 wi5x8u e particle’s velocity. The particle will

  03.34: A positively charged particle of mass M i j ) v onoxcy;5 8uoo;ixr.werfc7pns7(0v18is 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 i 1r 08rwvcc;i7 7o(xo)pse5fn o8.njo yvu;x 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 velocitrk): 1g cbovmg*qw6zoc *+,vlk s,lf)y 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 direction of the electric field in this region of space? Ignore gravm*lfcswk boogzq+ *gvkv6, ,1:)rl )city

  04.14: A positive electric cht +r;wvt.(mpse *t b93vst rh)arge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleratvsvttbrt9er +pm 3. ;tw*sh ()ion of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an angle of 300 to the h12n-y 5mncfe k3b(q2 chn ,1ci2rck hqorizontal enters 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 resubhknci nm (n-52f 1yqc3c2h, q12rckelting magnetic force on the electron?

  11.29: An electron moves with sp z vps2e)8mw(leed $1.00× 10^3\: m/s$ 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 ml5r*x r qqp60y497h ak5,s*jyi2.fnaca okog ass m travels at a speed v in a plane perpendicular to a jik q7xkncrr.al* ya56o5so ph2,y *04 af9qg 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 time?

  97.28: An ion with chhm+:+-y vuglbadq-3nq 7mugq db) 2z7arge q, mass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ydqud a:7-- 3g lqq g2hnu7)+zv+b mbmion 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 unif npdzf6c+gz 1 h/z1.xmorm magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force durpz6zm h1gx.nz+d/cf1 ing 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 fie8xd6fc-c5-cgd3csj8pkz )gv ld. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following qua - c)dc8ggcf-pvdz3cxs k5j 68ntities must be the same for the two ions?

  02.15: A positively charged particle moves to the-cqabku54) d,nmeh/ j right. It enters a region of space in which there is an e /c 4kn) b5u-djemq,ahlectric 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 kinelq(1m 8lt wfm(tic 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 elect8mny axk )cym:p6-xa.5d8b slrically charged beta particles is commonly determined bymy a:xyn l)c 5m6k8a8spxdb.-

  09.27: A proton moves straight up the ploq xg-r 5(g 3xvied1 oih3+t1uane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes txg11doet v iquri3-g( x+5oh3hrough this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron mo6iimlx8jh/d 4r,zp+v 8zb (qe ves in the plane of 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 dij8,z4m +idlvp( q bz6r 8ix/ehrected 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 wj*ucw6+jkb4 lith constant velocity through a region of space containing both an ljbcuj +4k*6 w
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 n 3l5cen 173bn+nfj82adj v ec.c,t8z-phr exaon-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 the figure. Ignoring gtjc28ef7 r pna13 3ee njl+5z,-hcnxbd8c.v aravity, 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.