09.18: A wire has a cokfmu -f3 u*b7onventional current I directed to the right. At the instant shown in the figure, an electron has a velocity dir3kf m- b*ou7ufected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure; yikzj/yh0qaw0 u(( z, which choice best describes the direction of tzy (kqh(iu;0az/w0jyhe magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the p lqrd6pg0 gw7md vb mn/i9 *5m4(v/preage with conventional current I shown. At the instant shown, what is the direction of the magnetic force on tr/d0pp7 4vrq/g v g*i(bdml w95e6mnmhe electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving towe/ rp ciwycj/mwuwqqu,se+o:o); ) /9ard the top of the page at the instant shown, what is the dirco+q,/y/; rueqeoc) p:w/j ws)i9uw mection of the magnetic force on the proton?

  94.30: The conventional current I in a long stran7 1:d3 x4d)ewm q n+4iy-/kuazqvbim ight wire flows in the upward direction as shown in the figure. (Electron flow is 1i7wq4vmk /bezany:nx d m-q u)i4d +3downward.) 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 spee/h0 pe :zx8dsm,)yqsp d enters a uniform magnetic field whose direction is pe pd8s/0 )smh,zp:ye qxrpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity11hwshc*e4 so/t2v s h enters a uniform magnetic field whose direction is parallel to the particle’s velocity./c*2hth1 14hvss osew The particle will

  03.34: A positively charged particle of mass M is at rest on a takm,wgvp vd7o3y m.n,)ble. A non- zero electric field E is directed into the plane of the table. A non-ze ogn)dmm.,vkv,7p3w yro 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 consta,+vxxdi .af* uzdg* c2u5rl p8nt non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of ugu ,.xi*zvp*d l c x2+adf58rthe 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 el9dky t6kue*q jxc)9u9ectric charge of negligible weight is released from rest between the poles of a horseshoe magnet as eq ukd9u*) ctykj9x96 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 page at 77/)+ta g07 diyquzv +pyxcza 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 d)z0 u +aaix+ tcq7 zvdy/pg7y7irection of the resulting magnetic force on the electron?

  11.29: An electron moves8nf2rr2vw7tq srdie5ah7v+y( 8)7f l7cyi ay 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 a speed v in a plane p:me*hg m:s (raerpendicular 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 force on the electron i*s m:h gam(:ern this time?

  97.28: An ion with charge q, mas0uzo*cpb2ahuxy4 98 ts m, and speed v enters a magnetic field B and is deflect9yu 4z2o*bt8 xcpu0 ahed 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 orbik2,zov t la, (uzopi:8t in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiencesl (8:ozauo ,2,tzikvp 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 the same uniform magnetiei nfxfj; u9;x nn;o24c field. The ions carry the same charge and xf9 2fn nx; ;noei4;ujhave the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively chcu7we ,n*5rpmarged particle moves to the 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 directionpc 5e7nmu*r, w 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 kinetist j2x:7j3; qmncn *ric 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 partp3ube t56f2yeqswfed.p: q1 jw9 6fa8 icles is commonly determined b 3uy:p.q1s j2ate98w be66fpf q5dwef y

  09.27: A proton moves straight up the plane of this page into a region thr:c-pqk :47csn:cw q cwk(0oiat has a magnetic field directed to the right. If the particle is undeflectirpw4k (w-nq 7c:o :qsccck 0:ed 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 regiowcsj raw bqbt/9/ 766dns of space along the abjct / d66qw9wbs/r 7dotted-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 Region II. What is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge m; tal c9v7dro wf5mo;+j39gwp oves with constant velocity through a region of space containt;f gwc jprl;woo7 39v9 5ma+ding 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 92 k,eiqyb6 wz:d -gjf-0rh sgbetween two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite direk sfghy6: r9dgjew-b2 i,q-z0 ctions 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.