09.18: A wire has a conventional current I directed to the)usw-kca/ /s6l8 oqc g right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on g/ )/w8su osckq6-lac the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice b4uq* m /bl(scvjr+6yiest describes the direclis6v(/um+r bq c4j y*tion of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page wwc7p,i t7vii )ith conventional current I shown. At the instant shown, what is the direction of the magne pii,wi)tcv7 7tic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For t8ru nct)kvfx(ppfr(* 6ap) 6zhe proton moving toward the topcn( 6r6rk)*z( xapt)fupp8f v of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I inh:+i*xvglt6b a long straight wire flows in the upward directi:b* vl6g+ti xhon 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 enters a g) oykj mt8;8+-u+nnx8r yocnuniform magnetic field whose direction is perpenmr+ty nx-c)o k+8gyjuon88; n dicular to the particle’s velocity. The particle will:

  98.10: A charged particle ws 4jr) n*+8cc*cwpndgith constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The parc+gns8pj d c4**rnc)wticle will

  03.34: A positively charget2 6xch8-jt zod 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. What6jc2tho-8 xzt 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 coo2w7g8 9x64kpa0e kdcx4af ks nstant 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 isx0k4 8x 6w feo9ap2k7cs 4adkg the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electricodgz- x *39kgp charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction oxk*dg 9z3pg -of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movu ofq0c;7xuluzr/0y- ing in the plane of the page at an angle of 300 to the horizontal 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 resulting magnety-0u 0xurf7 z ulq;c/oic force on the electron?

  11.29: An electron moves with speed fxek0:y8 v(it $1.00× 10^3\: m/s$ 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 tr wqvx r;3,xv9eavels at a speed v in a plane perpendicular to a 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 forceewx,9;v q3vxr on the electron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic field B and ic d1k:h0/n)y;xjvriu jz u(c 0s deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B0ij c/jnhkv;uzy:1rxud0) ( c are unchanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in wu8:6or4ju 3 t)sjmda a circular 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 forceta sw urm:o 86d4)jju3 during its motion, what is the ratio of the speed of the helium to the speed of the proton?

  10.43: Two ions trav3 5 :qdb2h5)dqak.50aigmcie j2t fcael perpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic fiel.f) mah5 iaqdq2 253k:diejtb acg0c5d. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves to th ul:-n1-dgw r4s x4wk- crb6f5x*soyde 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 region so that the pnuyr1d4x- scf45ldbgxsw k 6*r-w :o-article maintains a constant velocity?

  96.40: A proton of mass M andekkm d6tqmjwn)2: (p* 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 electrically chargeh i,zjew,v*;4v7my axd beta particles is commonly determined bewvi,7* h axy j4;zm,vy

  09.27: A proton moves straight up the plane of this page into a region that h.qmfek )u5mhv/cek)q;:f q: tas a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direcvhc) mtf5eqk: qq:m/fu; .)k etion must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two gzujb80(zy 4p regions of space along the dotted-line trajectory shown in the figure. There is a uniform e(yz0 pbju8zg4lectric 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 re: gv -l-*9bsgo6s2e2ll fy9eme r gs6mgion of space contaifyl 6-9 se-6eeg2s *m9b2rgslovml: gning 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 velocity directly betw ls t9u8,bx54t cr;sbbeen two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite 4tl,bx s5u; r98sbbc tdirections 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.