09.18: A wire has a conventional current I directed to the right. At the imvqmnq6c cj* o 1og),)nstant shown in the figure, an electron has a velocity directed to the left. The magnetic force *g) c,)jo 6qmnmco1vqon the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes tboy39s a bw q3,vyj-/nhe direction of the magnetic field3by, nv/sy -a3oj9 bwq at the point P located directly above the center of the magnet?

  11.34: A wire lies in the yup a.x4,k1cb 7za(vgx 1 tp/7koo ly8plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving dire ykbzyt 1klco 7au8 /.1v,(ao4gxx7 ppctly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving tot.fsst6q70 tsl k5f jrg:* 1ze ux)yd+ward the top of the page at the instant shown, what is the direction of the magne6t s 05 k):fyzlf*u dstq7s. gjr1+etxtic force on the proton?

  94.30: The conventionalln wif foz fych.5*t 7zy.y7+- current I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downwarfyz5zcithy7*.f7.ynf+ lo- wd.) 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 wief:s c7l:v*f lth constant speed enters a uniform magnetic field whose direction is perpende:lc :v7 fsfl*icular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform ma ;3k3dy)r yemj z5k*qdgnetic field whose direction is paralq 3)*md5d;eyyzr3j kk lel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tabldeyg6jn f 7mx 70.di3ye. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B iyy60ne.x77jd igmf 3d s 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-zero velocity axl2)mbs4eg . in a region of space that has a uniform magnetic field directed into the plane4 b g2mesxal). 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 neglyo b0luk).lx w)ab7.j4 jiy5 higible weight is released from rest between the p bj7.w5jolyxhayk.i 4bu 0))loles 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 pagexk l(,djx,de msv*sc01k.,i iqxf5 -m at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the planeq0lde-1,ksfj.,* (xkx5sdm cv i ,mix 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 5u,.+hqppr ewspeed $1.00× 10^3\: m/s$ 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 pla) *hb)b9j+n 1x tjuhkqne perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the electronb)+1unhqk*j hxb9 jt) 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 magnetic field B and ig qix*5dr) )exs deflece 5q gx)xd*)rited 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 uniform magnetic ((xmm3o i8kecntb 7t7field 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 motion, what is the ratio of the speed of the helium to the8t7mb((x i 3tck oe7mn speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magj n,jyjnwz6y+)mr 5+bnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantitm6y+5 j yzw,nn+jbj) ries must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It 0u w:g,kldf+a enters a region of space in which there is an electric field directed up the plaw0af d,ku g+l:ne 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 e6fce -s2f *-wqf dxeo4nergy $E_k$ 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 co6 )sl d94vwrs)rv zkc)mmonly determined b9z)lsr )r6dk w4)csvv y

  09.27: A proton moves straight up the plane of this page intodquv/thzhoy,u9t89 k33s/j zlj e, g, a region that has a magnetic fjzttuzk8d us9 q/h l/he9 ,,y,g3 vo3jield 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 gravity.

  08.36: An electron moves in the planhf8r7,*j a*sv v uojyt 5e;:t0kz+q jie of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform elety*os7jvk q*5j hj+iatfz ,r 8:0;vuectric 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 constant velocity through a region of s,)q)dgryh)tf vvz68uant(5 p pace containing vf, )drh6()ztpvngtauy8 5q) 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 velo*gx2mpa , vqhzl) nvl-6q+x/ucity directly between two long straight wires. The conventional current in each wire has the same magx*/- , 2unv)l lm pazg+vq6xhqnitude, 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.