09.18: A wire has a conventional current I directed to eh6+v5y:m 9pe.j wppm the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic forcm5p em6ehvj:wpy9 .+ pe on the electron at this instant is

  14.24: For the bar magnet shown in the figure, whi1w-;aq sf( if*pryxm hwi ; 25ri)-wknch choice best describes the direction of the magnetic field at the point P located directly;*mhs)5xfr1 w - kinr- aqifw2iy;w(p above the center of the magnet?

  11.34: A wire lies in the plane of the pagex,x8ds: ob e0t;j4 0io*vln ke with conventional current I shown. At the instant shown, what is the direction of the magnetic force okeljn,x tx*i;:v0d8o04o e sbn 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 moyd6t 14j ptuu66xw+t iqcr/x;mh:xg 0ving toward the top of the page at the instant shown, what is the direction of the magq d xi ttu+6xwch/60:g4;xu 16mjptyrnetic force on the proton?

  94.30: The conventional current I in a long straight wire.lo:+rt b (dti 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 heading directly toward it+l.titd rb (o:, the force on the proton is:

  95.16: A charged particle with constant speed enters a unifor0,h ha hyk7mmh)kp4r2m magnetic field whose direction is perpendicular to the prhh ,a2 mp0khy)m74hkarticle’s velocity. The particle will:

  98.10: A charged particle with cp u j3- 6 st:jfxzzqnl)lpf)(3onstant velocity enters a uniform magnetic field whose direp 3j ()jfzlfn:z63 -qpls)xutction is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table.ghkb36h mk;s0 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 tk h30ksb m;h6ghe 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 regionfc.yw j6xw 9me4),qsrpn- 6gq 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 dws c.q4gq9xp,fj-nr6m wey6) irection of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight iu 0 + mwd46;sml,x qzq5jaacs6s released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by th60q w+qsam as c;xjuld65m z4,e magnetic field?

  10.26: An electron moving in the plane of theuo9 2 e.ft /,5qmkbkou page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plkoqkum/ ,fe5 9o b.tu2ane of 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 moves witufxdt3k2ig; x+q 3rf* 1 ychpf0: y;tzh 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 massm8. b-i7yqrza m 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. What is the amount of work done by the magnetic force on the eyiam z8r b7q.-lectron in this time?

  97.28: An ion with charge q, mass m, and speed v enters a magnetic field B anw(v0tml ebs53 d is deflectedmeb( 5vws3l 0t 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 fielvexm,w1omx +))3ks)*wfsr za0.z.;nf e r dwad B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the same magnitude magnetic force during its motion, what is the rv).w ka;dmewz*.o+ s m)xs)f znr,ra3 1wxe0fatio of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perhea;k -/ s,r4knmopnfjg2v. ewa 95+wpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which oa w; 5r9 f,g khnm-njve/ok2a4sw.p+ef the following quantities must be the same for the two ions?

  02.15: A positively charged particle moves t1i n5v lt,sxt n5v4 p7nqf:3ej9r rmv+o the right. It enters a region of space innmltv,eq 7nfr:vx9p3 54vnj rtsi1 +5 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 mass M and kinetic enm7f: lwiibl-3:bt5vodf6 g /wergy $E_k$ 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 deegjxe3c7 r 8-s.cx 0rptermined b p0ex8g3-x7r e.rcjsc y

  09.27: A proton moves straight up the plane of this page into a region than0ka.e1p 3m95erwdpr :icfj1;.-vbl s pkq. ft has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there be a component of electri3ei.p9f.1rfc 5e j1r:.vlw- anpqp 0m;bkdsk c field? Ignore gravity.

  08.36: An electron moves in the plane of the pawry j97 58sxiz:o1an t7e /thsge through two regions of space along the dottedt zn1 iwe9j75/7a rs:txoyh 8s-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 magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region o j ounc8xp 3;hp;jez v.8/aa,cf space co j3cc.h ppex8;;n va ,aozj/u8ntaining 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 directly bet. tb6thm ha5ka 8lvc4*ween 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 regionmltab 4 8 v5hh6tkc*.a originates from an unseen external source.