09.18: A wire has a conventional current I directed to the right. At the instanl2-ortzct 8puls 4 ,5.q1d5 z qz1uiket shown in the figure, an electron has a velocity di, 5 luqzr1u-tes k1c48z.zipot ldq25rected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describes (mo )+u os3e6gukzg6y the direction of the magnetic field at the point P located directly above the ck+(em6s uuggoy zo6)3enter of the magnet?

  11.34: A wire lies in .;se0t diqnd fvxthxx/ 43/a) the plane of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is movsn0//hiq;)d afdx34 etvt .xxing directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shl6 tx( kj6pq:kown. For the proton moving toward thjq:6 k(lxkp6 te top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional curreniz(dy*46 +a ;btzmqb69viwkp. st/ pkt 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 b*;.ak(zq6 iyst6tb/vp+ p4 id9 mzkw +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 speed enters a uniform magnetic fiel d kok,* a .o*u3ii,7wpi fj;dr*h/ward whose direction is perpendiculaif*kr;*kju,ad.o *ra wwho 37 ,p/diir to the particle’s velocity. The particle will:

  98.10: A charged particle with constant v:ue3+n cit/g nelocity enters a uniform magnetic field whose direction ig icn/ e:nut3+s parallel to the particle’s velocity. The particle will

  03.34: A positively chv+*cs7ffp9deyr ;m:u arged particle of mass M 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 t*9u;7ed+ s yp:vfrcfmhe 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-zero velocity in a ;v7 +. cianepfsjm53 dregion of space that has a uniform magnetic field 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 regs av3+nf.j5md;epci 7ion of space? Ignore gravity

  04.14: A positive electric charge of n -7uqkgqc +4g:7:hunuhyk8rx egligible weight is released from rest between the poles of a horseshoe magnu:y8k7h guc47xq-knq+r hg u:et 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 the page at an angle of 300 to ri 30h5 h s5c/pqw;78(ypequcvh 5yeuthe horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At the instantehuq/ rcc583y p(vh0 5es7; wiyhuq5p 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 speed (p o.h,h*i.jja;+nnmcq/ez ,w:ups l $1.00× 10^3\: m/s$ 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 c9dljvuc . s+6/loqo nb4n.k(gharge −e and mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular patq. g kc9 ln/6lujson o+dv.4b(h 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 mcycslv40p9njs8je g*k 53.8asd)fnd 1m ,tpv, 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 unchanged, wpft c0jv95 y4c.a)8mddg, pkes831s*vsn jnl hat will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magne)ytv jx2bfoy -x8ydzptf d:ok./81o *tic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetvyy o-j )t2fz*1oo/xkb8: d 8pdfxy.tic 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 perpendi.,c +nx 4oyowepf4qg, cular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantitie4g+fcnoo4y we ,q.xp, s must be the same for the two ions?

  02.15: A positively charged particle moves to the right. Ito/bshv t2e4rx7r,x4ek .)e/ :yobbl a enters a region of space in which there is an electric field directed up the plane of the paper l/arte o4),bkh/r2v:yex o 7b4.xseb (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 masvzgy5 l*;y 0p fh)6kqbs 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 electrically crrspk26: jw*)i jxe8b harged beta particles is commonly determined by*x:2 s 8pkirb)6wrje j

  09.27: A proton moves straight0j3v wq m,znr5k;y 4mr up the plane of this page into a region that has a magnetic field direct3 n ,5;vzy04kjmrrqw med 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 i/up5o c7 cw)bln the plane of the page through two regions of space along the dotted-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 mag )5cp7ulb/o wcnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive cha0au8nd)1t zrb rge moves with constant velocity through a region of space containing both an )dz a 08rbu1nt
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 betw3gy d8 z;d-gtti b/ v96+bzztqeen 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 electric field in the region origin/d;g3z q9t+t id6z vgby-8 ztbates from an unseen external source.