09.18: A wire has a conventional current I directgq-74 pmg 6hboed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electromg4-ho b6pgq7 n at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes the)e0lv9go w jujda49+ kq yuq7- direction of the magnetic field at the point P located directly above the cente0q+g9uq -k4 d9)joalyewuvj7r of the magnet?

  11.34: A wire lies in the plane of the page with conventional current Ieq 1lsm54txgy, va5c4 shown. At the instant shown, what is the direction of the magnetic force y54 4 exv1m tc5gqlas,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 the proton movinhjbusct,qm-o6jhw, ): n+znp q s-u)3zj0uk 7g toward the top of the page at the instant shown, what is the direction of the magnetic )j,0 bhkzot)nn:h 7sp jsu-w3m, -6cju+qq uzforce on the proton?

  94.30: The conventional current I in a long straight wire flows in the upwaa)yp m(hm-gwh,drp) 5rd 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 heading directly toward hr(-p dymp)gha, )w5mit, the force on the proton is:

  95.16: A charged particle with constan *wbkuln ;r77 ddzwm*;2 fzp(yt speed enters a uniform magnetic field whose direction is perpendicular to the partic *k ndw;;dwu lpzm 27byfz(*r7le’s velocity. The particle will:

  98.10: A charged particle witu9w8. 5dq-kg8bxha/cu ese i ;4kg tf;h constant velocity enters a uniform magnetic field whose direction qx e5 8fhag ug/94u ;;edtcwk.8k b-siis parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A nonfvsaoz lo*w 6 ) xr()p91cf7qpuvr/( s- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out of the plane 7f)l*zv w qo) rv(fus/csr6(o1ppx 9aof 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 constaj o64jdayfigyw :9 18xnt non-zero velocity in a region of space that has a uniform magnetic fiely1y9i4jd8a 6 jg f:woxd directed into the plane 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 electriz(h xhn: :ar r(8l5ei2, ovswnc charge of negligible weight is released from rest between the poles of a horsesh o2axhw:e((v8n: szlnhir , r5oe 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 );iv/ nqpul;jzfg2zlt dhab:-/+zd + the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane 2lijudpv /b;; h+la)dzn tg+/z -z :fqof 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 moveshtz4f tya)-5 oljfzsg**v51g 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 − 9vy2r/g w,tlqf9xbo/e and mass m travels at a speed v in a plane perpendicubqgv x ,/wyfl9 tr/9o2lar 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 in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic fie0 ep xa6n/2nkyld B and is deflected into a path with a radius of curvature R. If a second ion has speed 2v, while mx y/6n e2apnk0, 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 kklu:),s- fbi*kx: rds 54toh5 bxks ,in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magneuxos kftbk-s:5,5bk)ih rs4,*l: x kdtic field. If each particle experiences 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 th0) (- 3b frcnzmaooxsh1,zt)qe same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities mu(0 nfrz,smc o q) a)31xobthz-st be the same for the two ions?

  02.15: A positively charged partiictb5jj84 *iwl4 b lq.cle 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 direction does a magnetic field have to point in this region so that the partic*.b5j8wi lq4tb jc li4le maintains a constant velocity?

  96.40: A proton of mass .lgcp0 *xkq70t t /+mp(jzhjhM 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 zolv410j.o iselectrically charged beta particles is commonly determined biz v0 jo4lso1.y

  09.27: A proton moves t)l58 hq3 tn5* uljkpfstraight up the plane of this page into a region that has a magnetic field 8uln fltt5hj3k p*q5) 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 plane of the page through two regions of spacepgc5q +be+yw 9 along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I direpeg5 +byc9q +wcted 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 chah qqv54s0- oc( 0yvsavrge moves with constant velocity through a region of space o(v-s00y4 c 5s vhqqvacontaining 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 v- abc5uclr9 hkonbi-u 5*k 2b7elocity directly 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 reflects the direction of the magnetic field and the direction of the electric field that exist at the location of the electron? Any electrini5 u*7klb h-r29o5b-cabcu k c field in the region originates from an unseen external source.