09.18: A wire has a conve mos /jbv9w) 2g0mwb.yntional current 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 electron at this y9s) mvjbmg 2b0ww./ oinstant is

  14.24: For the bar magnet shown in the figure, which choice best k88a(d1vu qls describes the direction of the magnetic field at the point P located directly above the center of the magne s8ldu81 vka(qt?

  11.34: A wire lies in the plane of t4*frsm zort-b aqp1;eom5n 2:he page with conventional current I shown. At the ins r-:21b 4;snpz mqarfe5tm o*otant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the lohv ot9k dcar7*/ub004yr b b9eft in a wire as shown. For the proton moving towa409v0rtuydc * r7 / 9ahkbbboord the top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a lohj9f,bs4 n.ejng straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of 4fhj sb,.j9ne 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 with constant speed enters a qd rb ),ku8c fqd.m(jzvl *-r20fpkn6 uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle *d-m (fju8rnkfk.)vrq b0c,ldzqp2 6 will:

  98.10: A charged particle with consta0dep)m + h3mk5 0fbzm f+xz8rant velocity enters a uniform magnetic field whose direction is parallel to the partimm+h b zkrxpe)af0z d5f380m+ cle’s velocity. The particle will

  03.34: A positively charged partigxr- n+pwkwasze+0ns 7 fk ;.5iqlo95cle of mass M is at rest on a table. A non- zero electric field E is directed into the plane of the tableikxg -7 onwwr 0;qzn5ssea pk++5f.9l . A non-zero magnetic field B is directed out 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 constant non-zero velocity in a region o)d-n/(gp , v2bdxo /c:mzaszzjxli/3f space that has a uniform magnetic field directed into /o2dbdxl -)j(cnvzs/ :/zza3mg, pix 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 electri5 s1aw5tiz :w, nt)gbwc charge of negligible weight is released from rest between the poles t)n,w wab155z :wgist of a horseshoe 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 pl*3qny yqq zz+0pzg94r mbts)4 ane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane of the page as shown. At thgyt03n+qpr 9)zs44zq z* y qmbe 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 mji7t r,vp*2cm2 q gx6qoves 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 at a speed v in a plane pervzu r2yicts-c)nuw548 w )ta- pendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the electron travels halfway arouni-uv8wc)-a wt4r)zn 2 ucyst5d 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 magneticryjztdor): 3z rr+.9z field B and is deflected jo z3zrry)r:zd9+t .rinto 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 m xv1ygavn y ;7*7h1ttczch ;6w/m5f vyagnetic field B. A helium nucleus moves in a cfz; v*7 6g cxy/yvmayn115w t;7chtvhircular orbit in the same magnetic 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 the same uniform magnetic field. Thl rd+) pv8gekes(an t(7f)o +xe ions carry the samexn7eg e))a+ s+ dfv8tr klpo(( charge and have the same path 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 a r,amdh.a7bk8qun s 0,/wu u:zj egion of space in which there is an electric field directed up the plane of the paper (see figure). In which directiok8bs: naw .qa,7zuuju0,md /hn 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 y )7rcltz )lbfjb9 7r5 rl(nx+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 elc+jc22 z (wgo:ch*7,xvjiupjectrically charged beta particles is commonly determined bcwj hcvpi2z(u j c*+2jgox:7, y

  09.27: A proton moves straight up the plane of this page into a region that has2,hukv+j(;d)/ aba ew;beynjb8+ xm x a magnetic field directed to the right. If the particle is28a) ;exjxjevuw/bha b(m;nbd++y , k 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 t-e0x)eicirc 5vhx9, zhrough 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 directcr, zvx 0e-c)5eiihx 9ion of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region of space*8qwl p;r-t qf5r3um z containing *lu fm tqrw;pr8qz5-3both 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 d l5(0 ou(z fqbshli.:lirectly 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 electric field in the region orq fl:l(bzl .(io05h suiginates from an unseen external source.