09.18: A wire has a conventional current +( wuai7m9fr nI directed to the right. At the instant shown in the figure, an electron has a velocity directed to the leftanu7+m 9i(wr f. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes th b4pgvzk14exl h5fi(+e direction of the magnetic field at the poi1 e54p+hv(kix fz4bgl nt P located directly above the center of the magnet?

  11.34: A wire lies in the plane of:;tc :ajjl0h;t(w cet 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 d(0te t; ccajjh;:lt w:irectly to the right toward the wire?

  13.30: Electrons flow to the left in a wire e 1n3fe a*7/:rqe1gap kch (uuas shown. For the proton moving toward the top of the page at the instant shown, whr 7ne1fuhap/a3c qu 1 *(g:keeat is the direction of the magnetic force on the proton?

  94.30: The conventiona 8i 8om 8ee lcqcfnzvk5kk+*((l current I in a long straight wire flows in the upward direction 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 headin+nkv(okzcql c(f *5eeimk 8 88g directly toward it, the force on the proton is:

  95.16: A charged particle wiyaj/8o*t7 pn oyab+ w-k lh3wi8jad68 th constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle wilan8ywp abd3-6 jko /+ta8oj7 y8wihl* l:

  98.10: A charged particle with constant velocity entbnl4z1ik 6a *cers a uniform magnetic field whose directinzbk*l1i ac64 on is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass Mk f6pgn-8nhfev 0ghk7zy(laqo / y10 + 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. What is true about the mqnvh0/ kha ozegf+y6(7lkp0yg-18 nf agnitude 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 in a region of spr 1izw jur6rbh9h *r+ 3ff(136ceng cvace that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of the pagiu*rvfrce +1h g19nwj6zcb3h3rf(r6 e. 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 pg(b7my o:l3() vh9 eeohko s-released from rest between the poles of a horseshoe magnet as vyemb39:helh7 po o()o-ks g(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 an angle of 300 v 2 ipl/z,18hoc z9xnjk,v1ndto the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the i92z 1cn1zkj 8hvn/ip, vodx,lnstant 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 with5h/zm w oslpotm z,bqho-9: ;- 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 mo6qzp84p fui28mh1pundzz 8.r ;z g t2 travels 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. Whatzz 1gu22z d 8prz8pp8qu4hnotf i;6m. is the amount of work done by the magnetic force on the electron in this time?

  97.28: An ion with charge q, on qjaz6h 0:i v7a)6y-t 8yzsfmass m, and speed v enters 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 unchangqaf:j7 v)zsiyn6 0o8-yt6zh a ed, what will be the radius of the second ion’s path?

  16.44: A proton moves in a cir0 w;ac.fsy 0 /r1fk5rt yfwm.ocular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experieny.rf y/51.sf w;fa0rk ctwo0 mces 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 l -ccbx os4 tu2r)h;f5magnetic field. The ions carcxocbu 24h5- sflt);rry the same charge and 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 moves to the right. It enters a region of sc(.cm-s crgz0gw9g .v19kun;rv5 boppace.c5k (g r-vw.r90;g9g czm b vupocsn1 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 velocity?

  96.40: A proton of masp*l )sh82c:jluxg a bz5.gc0i 6rsk-ws M 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 eleqxwq4kz-b56b 6tlzkyl1x) m j *2(k qtctrically charged beta particles is commonly determined b15b )-*z(xkm 4xjqq6 kyq bzw lttl6k2y

  09.27: A proton moves straight uinfbh +)p75wjti/q3s ) pfj(l p 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 diwfis+lnjfq (h5i pbt3 p)j 7)/rection must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane 2cnym qo2 7h7jtpdec3ae7t30of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Regia m3ce nq d3ohty2cj20t7p77eon 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 z*v n7uyegbr0/2mu +x / np*mqvelocity through a region of space contue0bgun mm/r7 *z/+pn vq2*xy aining 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 direct *pcr0r uxin9p( ,l;x6tejzh;ly between two long 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 reflects0u(p; cxzrhpjx*i, 69rl;ent 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.