09.18: A wire has a conventional current I direcqtar1.ol.n0m:6ey 6d i/y: .nephqim ted to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the elect.anm: dm1q:n.h 0.6y/itpo 6le ryeqiron at this instant is

  14.24: For the bar magnet shown in the figuycxu3 x; ; r.;ohfvr6k 6i5fc/o-fsb tre, which choice best describes the direction orf ox tx-6v b;sok;5cy;/ fif6cruh3. f the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current pdhgv) g (57knI shown. At the instant shown, what is the direction of the magnet)v7 h(pd5ngg kic force on 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 moving /2pid),1k9kv2ypkuud pdq x vrv,c 7:toward the top of the page at the instant shown, what is the direction odk1,9u:x kp/u v)kpd27 v i d2yvrcq,pf the magnetic force on the proton?

  94.30: The conventional current I in 5yx +cxui k92qb:lvu/a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton o y+l/c:bi x9vqu 2x5ukf charge +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged particgtt,go7m-v am8. ksv/.njb9w; u lb6rle with constant speed enters a uniform magnetic field whose dire. ngr;k 6 otj-u,l9sgw/va7bbv.8mtmction is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters mep o4a,/+o gpa uniform magnetic field whose direction is parallel to the parea4m go/op +,pticle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tab2 f2nqh vrvg08rl+mg5le. 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 electric force on the vqvr2 82m0hr g+nlgf5 particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton movea d gie,k djptdlnt)e5u. *q370u 2y)ls with constant non-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 the page. What ite *)0ye nd . kd q)d7ajl3pul,52uigts the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligible weight is released from rest b6-mp8tpn yle:kp o2 *uetween the poles of a horseshoe magnet as shown. What would bokm2:up ppy*6 -t8 nele the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron movr:0+ngrq iv ,u;1jwj)nsh oemb5 nc,;ing in the plane 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 shs wrr:ugm5jin ;0ne ;o, hvcj,)1+nbqown. 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 ..py:b7 e- pi9ai1j ye hjkmeg6(s.qywith 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/yak1 cqc : 3fi)zqiu1g54iwr in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R.qu 5k/yi1)izgcri1qwc a:4 3 f 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 time?

  97.28: An ion with charge q, mass m, and0jzt0hg8izc8 speed v enters a magnetic field B and is deflected into a path with a radius of curvature R. If a second ion has spzj8g08ithz 0c eed 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 magneqw9, v tp.+ajjtic field B. A helium nucleus moves in a circular orbit in the same magnetic field. j+qwtj p.,9a vIf 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 samkv 1h-8f nuz0of/sf8 se uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the twofs-v8/nf fz 08suh1ok ions?

  02.15: A positively charged particle m-:ti e(z h:dc pi18s9km 7(,dvxi tkbqoves 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 magnetic field have to point in this r:-v9z1bpc 8dxt sm7h:i d(qi,(ek kitegion so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinet.eyi3 j *3ywr ;sxjd1bic 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 common-,quhguq hz 3c7im6 (qly determined bqic 76zq q3h- (uhmg,uy

  09.27: A proton moves straight up the plane of this page into a region that ha2vegeqmnfpoh40*5-yh 7c :ckme3fx ) s a magnetic field directed to the right. If the particlefnk7fmhe c5) g -4hqv2p*0me oex:y3c 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 regionf7 c8ee32l a;u hdedf z2k,g4ys of space along the dotted-line trajectory shown in the figure. There is a uniform electric field in Region I dired kl87z uf ;2gch4fye,3ea2e dcted 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 velociw9, 0krgu zv6qet,s3ety through a region of space containing both an g, 06vsr3k9uwze,q te
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 tw i1sctoi9,4 wfo 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 electriw fi4ct,soi19 c field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.