09.18: A wire has a conventional currj - qa)c 9f1gcht xx)q8:,au+jtb-qw aent I directed to the right. At the instant shown in the figuwx-qj: xqcb) h81aua-+9tc jta q,fg)re, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whikn1) fmtp0;vlbe*: ,h*xk1; ehahcbech choice best describes the direction of the magneti chh* mkn0 bbp1al1fv)e;e ktx ;,:h*ec field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currefrjarhku e,0,q;5s k ;nt I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the ws;q0uak ;, fkr hej5,rire?

  13.30: Electrons flow to the left in a wpsbm 3wv i9xays)0)vw8(l b1eire as shown. For the proton moving toward the top of the page a0a1l3 pbw )xs vv9wbsei(8y)mt the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional cwd+r3tisc:(nc so+ -b urrent I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the cb (+s rnds-io:wtc3+ 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 particlk8f6f1 -rf1 i5bwck8 h ms*ylxe with constant speed enters a uniform magnetic field whose direction is perpendicular tb lxkm*f-5i1w88h f kfy6rc1so the particle’s velocity. The particle will:

  98.10: A charged particle wito(*is ,tlgqzt5797vy 60ho a,kaloiph constant velocity enters a uniform magnetic field whose direction is parallel to the particlya 7 6,5o9ogist *athqk7(l, z0op ivle’s velocity. The particle will

  03.34: A positively charged n8k5jzjly *(rparticle of mass M is at rest on a table. A non- zero electric field E is directed into the plane of the taz8lyn*kj r(j 5ble. 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-b6y ot uch (7(7htg,dczero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The ch(byt 7 (7coguthd6,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 negligible weight is released fwt+(:axx0t:chubcp,q6g:inp;kna5 rom rest between the poles of a horseshoe magnet as shown. W:gxa0: n biaw;5( ptc:6pq +hucn ,tkxhat would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plankodl-+tf xi.0 e of the page at an angle of 300 to the horizontal enters a region with a constant ma-t+ .lo fi0dxkgnetic 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 magnetic force on the electron?

  11.29: An electron moves with s ;gbif-(vyi c tn tem)k,8y5g/peed $1.00× 10^3\: m/s$ 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 trave zkno:) z4rw1y7xca 1als 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 electr4k1:a azxwo7c)zyr n1on 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 entq zyi;ju-ooton.f7)akf ua h.; ee74 7ers a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while m, q, and B are uncfe iju ku47o;a oe-t7zoyha.fnq).; 7hanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a unif,6:g 1 6h uyjenrxo*3gkm m hqiqot638orm magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic u6mogxe, g kqq n6h j6rt31i*38omy h: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 magnet4j*rwwew *(gp/fzg r :ic field. The ions carry the same charge 4:j * *zewr(pwgfrw/gand have 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 charged particle jio 5*u6zm8k0*n toirmoves 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 direction does a magnetic field have to point in this region so50 8zi mtru k6jo*i*no that the particle maintains a constant velocity?

  96.40: A proton of mass 8e84fut:m ejv2gd7+wsf 8p mwM and 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 charged b 5* /d6 6; epaicxv2ylqd,ei3ng;qu mleta particles is commonly determined bu epd2i3 g xnde5yic6;qql*lmv ,;/6ay

  09.27: A proton movei*xfp+jx qqgy 8h q0-i-y :)qxs straight 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 mustx8yxq*:yiqf g p0qqjhi -x -+) there be a component of electric field? Ignore gravity.

  08.36: An electron moves iny/b,s wu2a q7euq0a a( the plane of the page through two regions of space along the dotted-linby,aq(q 70 ase/2u auwe 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 moves with constant veloci jjxuk:3o4(wvty through a region of space containing botv(j ok3jxw: u4h 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 velocitqgm nmd6vf.gtna4-l d;(/d l+y directly between two long straight wires. The conventional current in each wire has thn 4talvmn d6gl./ gd;f-(qmd+e 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 field in the region originates from an unseen external source.