09.18: A wire has a conventional current I directed to the right. Ata:nyaqwi o9w31 5pv hs( 24f/kwuv/kk the instant shown in the figure, an electron has a velocity directed to the left. The yi5 vk(k p/qv ao :9w31sfhnuw4wk2/amagnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the f;3 tqwe uq7zl8igure, which choice best describes the direction of the magnetiz3etu7w; ql 8qc 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 cys0 ui4g/ pnn,urrent I shown. At the instant shown, what is the direction of the magnetic forc0 y,s nn/pgui4e on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as sh/u fts) 8sabt5l1pi0down. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force oa0sbdpf8)t su 5 i/lt1n the proton?

  94.30: The conventional current I in a long x cag3-6cee,kk1bru8 straight wire flows in the upward direction as shown xcre6-1kc 8bku, ega3 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 it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic 43b7 .d wo)s m0fudptt uw5g*wfield whose direction is perpendicular to the particle’s velocity. The particle wilt)w4gsu. mpufb 0w*d5 ow3td7l:

  98.10: A charged particle with coo 81tyvbp;ghf 5; qzn+aw; 4tmnstant velocity enters a uniform magnetic field whose direction is parallel to the pao+bn4v;wm fzg1ta py;;tqh5 8rticle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table. A non- ze-6ty q2a kita7ro electric field E is directed into the plane o7-ttq yk2aai6f 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 particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton moves with constant nlpul kvvquk 82 )r*9b5on-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 is the directi92ruup5k)qbl l*8vkv on of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charp i*fgi dx2f6 ehv+e zy-w8m34ge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the directio2fhfm ie +d4iz3 ypv6-x *g8ewn of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an anglu jbil2hs4kt-p) 5p:wa.q+s oe 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 best describes the direction of the resulting magnetic force on th 2ht wpqj: 45+lpbsu.k si)ao-e electron?

  11.29: An electron moves with hq42d r0 r8uybspeed $1.00× 10^3\: m/s$ 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 charges:wuq:n0v o 9m −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 electron travels halfway around the circle. What is the amount of work done by the magnetic forc::omu90 vnwqse on the electron in this time?

  97.28: An ion with charge q, mass m, and speed1kx t7;k oy(*l2* o qjthc9:jamrhf5h v enters a magnetic field B and is deflected into a path with a radius of curvature R. 72yot91(;ah cjoj h 5 x*rlkhtq*:kfmIf 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 i u;.fz/bqpwnf4wp,1in a uniform magnetic 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 pw/1w f.i z,nf;q upb4of the speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field1;ezynun.r 3 wwy,) tc. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities m1. ) ntw,cw r;yyen3zuust be the same for the two ions?

  02.15: A positively charged particle moves to the right. +p+69 d,k-1hcj3ix0hrcm vboydk p 4xIt 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 region so tha+m x3196p+pdc yjxhvir4c ,-dk0bhk ot the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic es,ggobg*wq-:d e0pq0l: 3 yi gnergy $E_k$ 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 determined bcudidz )(2y0dy(c z2diy0dud )

  09.27: A proton moves straight up the plane of this page intx/ijthkhk5clm0f 1 )g uv6 .y1/zi.x xo a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through thisi/ j5kkxzg.t h . /)x1cx0 6ly1uvifhm region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the pagehm*xt ;.3 ni*a +gsc;4 nqrpvt 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 fie 3 .t nmghp+;n;qxrasicv*t4*ld 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 velocity t1-ty5 i5)5s0zizaxpjxcj o n2 hrough a region of space co0ot-y 5jxc 1ns)52apiz5 zjixntaining 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 1 0iqpr mfd nh3w5ofcu:4l*2g-vmyd/ non-zero velocity directly 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 choiceq p2/-4mgducfr1hwvn*fmo5:0l 3i dy 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.