09.18: A wire has a conventional current I directed to the right. At the ins42i3aw u f7d+w;otb1dqby+h htant shown in the figure, an el 1u+7db42tbiwq 3 ;fy d+aohhwectron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown hd.gi:s0wf0j2 3pdb k in the figure, which choice best describes the direction of the magnetic field at the point P located directly above the cent.dbjgkp0 2 3ds:0hifwer of the magnet?

  11.34: A wire lies in the rd-a(t0o2a qy5/ckik 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 movid2karc y k/i5-o 0qt(ang directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as smm*s- +gnmty ib;t /( x-web6khown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic egmt;b xy n tw(*/-ib- k+smm6force on the proton?

  94.30: The conventional current I-+f)0wjake* aawm9phyx / g8yla * -cn 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 +e is a distance R from the wire and he+ gyjyaf/pax8) -a90wcmel an-w*h *kading directly toward it, the force on the proton is:

  95.16: A charged particle n;p 1 y;lrdpr3with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocit;p;3lryn1 pdr y. The particle will:

  98.10: A charged particle with constant velocity enters a unifs*mzu9a z3 m+corm magnetic field whose direction is parallel to the particle’s velocazmc*zs+93 m uity. The particle will

  03.34: A positively charged particle of mss;(ty c-8 odz vkk-t 1mof38u fbs1v;ass 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 the plane of the table. What is true about the magnitude of the b tf(vds ;ksmo83-k-1o;1vcsytf 8 u zelectric 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 regif u:stly/a-2 mon of space that has a uniform magnetic field directed into the plane of the pagea -t/ f:2sylum. 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 electric charge of neg0qe76 n 6rblhd :+ nykh5s)driligible weight is released from rest between the poles of a horseshoe magnet a6i)+nsl:d 0hye k7r6 q dn5hbrs 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 m7 w,rs-7r5nniv(euo 7f4p rmof 300 to the horizontal enters a region with a constant maeorv4wmimf-p nrnu 777(r, 5s gnetic 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 resulting magnetic force on the electron?

  11.29: An electron moves with spi5q ba cn7tpp6h 10,rz 9fyph6eed $1.00× 10^3\: m/s$ 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 tr.a)eix: iv. cwavels 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 wc.i:avi x.)etime 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 p fxk 2uh85k(iwrx-z0fb6t3s q, mass m, 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 unch2 5h-f3fu0r( sx6piktk8 bwx zanged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit (foe 3- udzn to9t)f,win a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same mn3(owot t, dff9e-)uz agnetic 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 magneth3,xdwyo6 *zg6l .v9o ttxz3;:to :x4ckl kxgic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of t9 6volx 3tt.:64gkxhcy: 3zg;w*lxoz o d,xk the following quantities must be the same for the two ions?

  02.15: A positively charged partiz qg)*b k5b jqo.i:s )mv7smf8cle moves to the right. 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 z )jso8 kvqs5gim 7:).mqfb*bmagnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic wu01 q0(k:m porcb2toenergy $E_k$ 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 electrica yb +ii.w(jd5dj;wgb +lly charged beta particles is commonly determined bwi5(gw+y j j+bidd; b.y

  09.27: A proton moves straight up the plane of ic faa(hmw 0 ev),v08nthis page into a region that has a magnetif)8 m vhia,a0(c0vne wc 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 electric field? Ignore gravity.

  08.36: An electron mo cja)y. )lcf h)xz.tu b5fg65aves in 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 ib )ca)jay..gt6zufcx5hf5 ) l n 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 ga9x57q9 nwyy velocity through a region of space containinayw9gxy 59q7ng 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 de45,8 xpfbbmx irectly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite dirfxeb45b8,p x mections 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.