09.18: A wire has a conventional curren6( tncrs. .es.d*jmkut I directed to the right. At the instant shown in the figure, an electron has a velocity directed to thjcrne.6us*.sm d(.t ke left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whie8yj3z3j 2 bcxvg l;m7ch choice best describes the direction of the magnetic field at the point 7l;yv38zb j3xjeg2 cmP located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional 6( r gbj zyeemyt5.rf;r7)x.bcurrent I shown. At the instant shown, what is the direction of the magnetic force on the electron that is movm. .; 5ybrb jtyge6 frzer7x()ing directly to the right toward the wire?

  13.30: Electrons flow to tc/xrde9sg9 c 7rkzd7a6x:r)fhe left in a wire as shown. For the proton moving towardax9d9 7)k76c/zedxgfr:r src the top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventiona8x/nmh/2emq f8j c)kz l current I in a long straight wire flows in the upward direct8h 2kjz mnme/c)fqx/8ion 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 proton is:

  95.16: A charged particle with constant speed enteryzyk7 f6o-t(w yv ky3+s a uniform magnetic field whose direction isyy 7zk wv+y-6t3 yfo(k perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magn)b (.0gu3mux. apd3meio rj:metic field whose direction is parallel to the particle’s velocity. The papbi) m(.r ome0m u.a3 udj:3gxrticle will

  03.34: A positively chs3hx jxbse 9-:arged particle of mass M is at rest on a table. A non- zero electric field E is directed intojs: bexx9s-h3 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-zer h, oa9a0*q:jphhn7f - symbk)o 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 ths:k)a*m 9j,0onahh -7 qyph fbe 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 from rest *7io5vkj. sm( qzmci6 between the poles of a horseshoe magnet as shown. What would be the direction of the accelerammj6c.7ivko is 5q(z* tion of the charge caused by the magnetic field?

  10.26: An electron mof l3b89 bfg+pmving in the plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally inmfb93g+ 8flpb 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 m z; up4u:iz4iyoves 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 chbxuyg ts5kh1n6c 8n/ab( ub+6 arge −e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitudey+18nh/nt k cb6x5bbau gs6(u 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 charge q, mass m, and speed dyjfu59u (+yz ptsr+21/ rxilv enters a magnetic field B and is deflected into a path w15r9 z +p+yxuui y2 rfl/d(tjsith 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 uniform magnet1wq- pxcsz)+- hy)ykn ic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force during its m1s k )ywpq- zn+)chyx-otion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpji 5km 3tr(5lvendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radiutvrk53i lj5m( s in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to the ri 0ksb/rm3 wd:/lt n8r(o i;paoght. 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 region so that the particle maintains a constant velocittlor: o0anbirk wsm/ p(8d/;3y?

  96.40: A proton of mass M and kinetic enernly*4 )p( b7ngle6manqo33pe gy $E_k$ 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 deterl+k f6bj(+xk79w;cnkxlb 4nb a+vyait* j3r-mined by7k+9+nay;v *knb6jwi jbr4fbk(lx -tx3+ c al

  09.27: A proton moves sw9xt4 p m0-gqntraight 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 through this region, in what direction must there be a component of electric fit0ng p qwx-m49eld? Ignore gravity.

  08.36: An electron moves ic30o5 ceq-kfd,.2e ;hjdl rt fn the plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There fd2k,d o0 e5 c .f3je-t;rlqhcis 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 wi ; 8zjcx(mjtiv8fa30we-q. zeth constant velocity through a region of space containing both 3qv itfe88(-mw; x .cja zjez0an
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 directly between two l r4kwnb 44k,ulong 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 the magnetic field and the direction of the electric field that exist at the location of the electron? Any electric bw44 knrk,ul4 field in the region originates from an unseen external source.