09.18: A wire has a conventional current8 3sh63;g3,dpfac qjvgn1yng.txi2i I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electroxnn3a h gi3 jyfgd v;8, qptcig3s621.n at this instant is

  14.24: For the bar magnet sh)jpb13vqo 5ho own in the figure, which choice best describes the direction of the magnetic field aob5) phjoqv3 1t the point P located directly above the center of the magnet?

  11.34: A wire lies in the plan35 q8umeb 5*e ,jgruszwfz*p n/e)je(e of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic 5 *juzf5gq* pzj e)nws /reeebu,m83( force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow zuk;7-wb.ue/rhexp4w5o v e 8to the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, whato8z.vur 4xe keh/-; w57bwuep is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire (ul(+x d2cax qflows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of c(ucd 2( xxqla+harge +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 constant0)wegdjx/0b5:p n;sk s c bcdct:.db 5 speed enters a uniform magnetic field whose direction is perpendicular to the d ccsw :es;ct.x/k0gbd b:d0b5p) 5n jparticle’s velocity. The particle will:

  98.10: A charged particle with constant velojp z.3.s ,a:w k(bbp 5u8dgbu c3jp2mvcity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle s3wp gjdbp. bu.3kuj 8a :v mpc(,25bzwill

  03.34: A positively charged particle of mass M is at rest on ee obv;ltk38z+7n ym )pc3 pbu*6 +c8 clh,kwca table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B is directed out)w3cbc7 8vp6 c+c nmbo;l3 hk8luy*pte + ,zek 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 conc-fmkk,a3;c hr40 fdz1e;al q stant non-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directlyahc;4,r1 adc 3f- l;mqek0zfk 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 char6y5n,n b,w cd hnlxm1:ge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would x1 ,mhwb5nd nly n6c:,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 to the htbix.0y fl t1+9ybmm;orizontal 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 ft m1.mt 9i0b; l+yybxresulting magnetic force on the electron?

  11.29: An electron mow0s 7od(uo;a*; vxnjf ves 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 atsxij vy*-)j 9i a speed v in a plane perpendicular to a magnetic field9j-* xsi) ijvy 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, tts.v:. ys 05 jr;ojph5t.rpgmass m, and speed v enters a magnetic field B and is deflected hjrts:tr;yop0. tjgs5pv5..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 orbit in a uniform magnetic fgvy9 -h*q*xqwield B. A helium nucleus moves in a circular orbit in the same magnetic field. If each par-* qx9hywvq*gticle 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 the sa h q3l*gbvtqeblnk 8*ec88 s90me uniform magnetic field. The ions carry 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 i*g8 qce*ek llb9v qn0s 88t3bhons?

  02.15: A positively charged particle moves to the riqgt; 9 pq8()bgonsd4ddx3gk /ght. 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 f;/k 4n()pgd 3dtg8q9gox s dbqield have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic xobe0cz) a 7(qenergy $E_k$ 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 chargew jz +yjsa6xv ;5c cm9,)+11bqkrdnz gd beta particles is commonly determined b+a)g ;xdcjk9cm1 bz+5rwjvq6y1n, zsy

  09.27: A proton moves straight up the plane of this page 5x;pvuqfpwu(z +c dokoh0l,(v t r:/+into a region that has a magnetic field directed to the right. If the parti;kctoh,z:fq(v+ (rpu vw/0 d+5loxup cle 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 regionsk ;ge8 4fhs9dzwzfq+* of space along the dotted-line trajectory shown d4sehqgf9 *+ 8zw f;zkin 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 wi(bhus lntz 6c36+7:4q nwynpfth constant velocity through a region of space containcw+b64 6p:z(7ynn3st nflhu qing 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 vel 5ofpc/n7q u p*igf9(locity 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 reflect/uf f9 nq5 og(p7p*icls 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.