09.18: A wire has a conventional current I directed to the right. y zvjlb5:15u3 vw+if zAt the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the +5 v 5 :1uiywfjz3zlvbelectron at this instant is

  14.24: For the bar magnet shown in the figure, whichvxlqb;2 flyw ti6xp)es+-+; c choice best describes the direction of the magnetic field at the poi)qv 6 ;slxp+b-i+lc2texwf; ynt P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page uw8 6bmnho1u 9with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward themu1o6bh9 nwu8 wire?

  13.30: Electrons flow to the left in wlm9e; m0 l.dogn q)t*a wire as shown. For the proton moving toward the top of the page at the instant shown, what . dgt0wme)*9;ml qlnois the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire0nsgs wf7wbn nggj zvw9-6q1yt8y 16. 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 iw-0z vg.9y wgwtjqnn1b 18s6yg sf6n7t, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic fiel k8vz/2n andg+d whose direction is perpendicul+advnng8k2 z /ar to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity(kwtqe(; nwv . enters a uniform magnetic field whose direction is parallel to the particle w(n .weq;k(vt’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- zerp; jyfj,7 kgk2o 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 tablegj2jky7 ;pk f,. 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 nocz *o14gu a:;u gy,seon-zero velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up the plane of z1a ,y;ougscgou: e4 *the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of nebde5:; h t .-kwfxz-4yr2r dnogligible weight is released from rest between the poles of a hoh2;zr 5t on-x edf ry-w4:bdk.rseshoe 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 theal:xk,qh*zv0 i + xk4n 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 the instant that the electron enters the magnetic field, which b+4k ax0i q*xhkl n:z,vest describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves w5*geu/w ndc)/lkr2 p9do4 oktl.ke 3h ; zw(vgith 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 tr (-n9o9v9ecycwaa8nnl g w )nze:o6rq4(co4o avels 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 electron in this(ocr 9l8 w6 n ao:eace94y-o9v n)4og (nwqcnz time?

  97.28: An ion with charge q, 9 ji4 cdq-qv7-/ck.kbo *m,pem irt:amass m, and speed v enters a magnetic field B and is deflected into a path with a radius of curvatk*oc7e4arb jkv.ct: mpi qq-im/ -9d,ure 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 aaoa: 6fw -*ndt 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 magnitwf6-nd*aa to: ude 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 pfnxh p 1f25k5pj3w(d,;y)npcg mai 0s erpendicular to the same uniform magnetic field. The ions carry the same charge and havefam2d0, gw(fp;xj )ps 1cy3 5nihnkp 5 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 region ofuom35aqp . 8jj space in which there is an electric field directed up the plane of the paper (see figure). In which direction doe5 j.juaqom8p3s 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 energy h4wf*c zy;z-a.e8v nu$E_k$ 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 detufsvx f,/+ n, l24ho-u9ezuvf ermined byf +of,xs,ul/vheuu-n zf v294

  09.27: A proton moves straight up the plane of this pib u39gf g mjpx/a.pghu.8cx 9migm85 ;a1 o3oage into a region that has a magnetic field directed to the right. If the particle is undeflect9/g59xu3ig. j83a m8hpf1om a xbomc;.g u piged 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 oico74sztm0;wn2 yp4two regions of space along the dotted-line trajectory shown in the figure. There is a uniform electric fieldz;ocptw0n7m o 4 ysi24 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 l ockrkh16litpk-)*( moves with constant velocity through a region of space c -pkikr)k l(6c1h* tloontaining 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 between two lo/z6a 1w /ytfc;:auw xbng straight wires. The c/w cxfaabztw:uy/16; onventional 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.