09.18: A wire has a conventional current I direc lv 781.khnxp :spznz.ted to the right. At the instant shown in the figure, an el8 l k1z.hsvx :ppz7nn.ectron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnetli ,+3t;re ppg shown in the figure, which choice best describes the direction of the magnetic field at the point P located dir;+rppt e,lig3 ectly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventios)ytfq 68vcdc j6 ezz:x f*(d4dvmk0*nal current I shown. At the instant sysm 6zx vd**80 efz6qtcdv:d () f4kjchown, 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 liv4 u8ddie5 g3r/dr9 .jraw(peft in a wire as shown. For the proton moving toward the top oajr i3r/wd d9er.ug54 vpd(i8f the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional curu.: wrrd:g9anx:+f fu rent I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a protonnu xwd9f.ag: urr+f:: of charge +e is a distance R from the wire and heading directly toward it, the force on the proton is:

  95.16: A charged part)z (q edjbln;+icle with constant speed enters a uniform magnetic field whose direction is pernel zjqd b);+(pendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unifornju0 k b4fq:m0m magnetic field whose direction is parallel to the particle’s velocity uj fb0n:mq40k. The particle will

  03.34: A positively charged partixqr s*z wrgb60 ;u-c/ecle of mass 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 electric force on the partiq;/0rcus-xg*wb6 e z rcle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant non-z bwt2wae)g-98q ba tnn69jck-ero velocity in a region of space that has a uniform magnetic field directed into the plane of the pagw )k2 -ngc9w9-ebtqj8na6abte. 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 8ws *cmqdm;la1ma30mof negligible weight is released from rest between the poles of a horseshoe magne3lm0 m aw;mdcm1q8sa*t as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in th(cumeow / +ty(e plane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horiy(u c/wtmeo+(zontally 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 vvqx9b8ak(8 k+0 hbpfnp 2h1gspeed $1.00× 10^3\: m/s$ 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 wib 74l8;j/afe0p: 3bauggm2yxpx nfe ,th charge −e and mass 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 electr4yup axpb ;:7e,elm830ggb n2ja/ xff on 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, and speedruf0pcd038)v5epdwr n9 ( qg o v enters a magnetic field B and is deflectedw)pv05(rnuqcg9 df 3rd p80e o 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 5wkod w4wb 0j4magnetic field 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 ratio of the speed of the helium to the od4kw45wb0 wj speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic fg o 7z9p) t.-jomy4 :eij,doaf(m3whv ield. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantit-vd i47 (3 hoj,g.)ejfooptma m:z w9yies must be the same for the two ions?

  02.15: A positively charged particle moves to the right. It eni* p8cfb2e p7bters a region of space in which there is an electric field directed up th*c7bp 2febp8ie 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 t47oply vgrcg74;a t8 ufo8 i7and 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 electrica4, iek yb h5dir5i4-hf*khi y,lly charged beta particles is commonly determined b*ibhhridii h4-kyf yk5e 5,4,y

  09.27: A proton moves straight up the plane of this page into a region tnd6+aiqgnhd a7 1(xb xc-1cy,hat has a magnetic field directed to the right. If the particle is undeflected as it passes +d1a(ac,n1 q7h-y6dx xbn c igthrough 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 through6fbbx4doc n5gz 7uqo27fs8s5 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 5 u2b7 5szqbon4dc7 g8fs6xof 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 con3:i4o7y- +k uia+ovomtie-b nstant velocity through a region of space containing bouoto4ineo:+k iv7mi-by- a3+ th 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 82 f+dd)yil9 p.r5rs cc4dawd two long straight wires. The conventional current in each wire has the same magnitud)5 wdy2i c +sr8d.d94dafcl pre, 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.