09.18: A wire has a conventional current I directed to the ;fm / i2 cr6dcfpe35z cjym21aright. At the instant shown in the figure, an electron has a velocerm czmi ;2jy1fpa 623f5d /ccity directed 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 txx x+g)6yeei;he direction of the magnetic field at the point P loi;x) ygex xe6+cated directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional currea.7nbj(3xrj vl ja );dnt I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving djv lnjdx.a;(j 7ba )r3irectly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. dcxfc 6cbuu46s+d/m/ For the proton moving toward the top of the page at the instant shown, what/d dxbuc6/ucf4 6m+s c is the direction of the magnetic force on the proton?

  94.30: The conventional c)3(v dukwg2+osv - yuaurrent I in a long straight wire flows in the upward direction as shsvy2u)g-+ ko(d3 vuwaown 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 it, the force on the proton is:

  95.16: A charged particle ,s7d1e bj5-i-qqw zb jvf(i7 fwith constant speed enters a uniform magnetic field whose direction is1zfb7-d5qj q ,-ifjb(7i sewv perpendicular to the particle’s velocity. The particle will:

  98.10: A charged parti 0qhghbj97nabxzfl81d0 dje* ,(im 4lcle with constant velocity enters a uniform magnetic field wxb0i 74la1gzl em bn,j89*dj (d0fqhhhose direction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on aq3:b5 e -9f f-cailjuz 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 c9 :ulfe5jq-f 3b- azithe 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 regioacu1iw ia d t)9 )z6na8h xp6bvdc)b,.n of space that has a uniform magnetic field directed into the plane of the page. The proton mbwi a c),186ahi .dc)9zvxadt) nbp6 uoves 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 ele6kmfh-cw d +y3/al +vvew 7ht,ctric charge of negligible weight is released from rest between the poles of a hoc6 f/l3e mhhkwyd7++ a -w,vtvrseshoe 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 the page at an angle of 300 tvv. fj yvvl)r:n9s6pqyir5r68fo93wmy+j;b o the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the pagy96jv68v9vlf3byqrw)+ 5mrs;fo v .y p:jrnie 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 wit6rxv08hfmrx+zr*8rs h 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 travrc)p*35hc0z nerpe6bkk r*4mels 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 c4k*chm*6r enbrekp)0z35 r pcircle. 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 field B and m vw 2erqie/3xfog a 1tw9:23wi;uvu3is deflected 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 r21i/m 9 uxwwefv2egi3;vwo 3q3ta:u ion’s path?

  16.44: A proton moves i /j f2x idrw,)+yl/kvin a circular orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic fk+ywvr x)ilj//, fi2dorce 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 magnet8q7/e goce9fx vr,k ;lic field. The ions carry the same charge and have the same rqov ;cxe, kef/897lgpath 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 r(c3p5lt+ma*49vp y*igocd;j a ksg5 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 hdc*gl t(i3avg opar4c955jyp; +sk *mave to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M cs 7upej:-/h5qsu/ u0pqfm d0and 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 beta particles is commonly determiniwv-, *ehv;qbl+pvo9 f/ k9bw ed bwpq-okv efl*i 9wbv+b 9 /;v,hy

  09.27: A proton moves stv y* amtb/ zmn jv8./xbp1slaj3 d l+.ajvx)*0raight up the plane of this page into a region that has a magnetic fv1/ydjn .tz8 lb)v / b xj*m.3aas jamx+*lvp0ield 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 2(5iu qf4s-ks 6 p mhwil8uwu8of 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. W(i ms6wu-hflu5pi8ukqw2 84 shat is a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a ovcp9u+thr 8l8/-) owbo.luq region of space containi.b+/tu-8 cor8 vohu9o l w)lqpng 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 cons 670;dn4)c 7bh9/aphg w:vqqmbfzhbc tant non-zero velocity directly between two long straight wires. The convebw0:c)pgv ch46d9fh / zqb77a;mbqhnntional 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 originates from an unseen external source.