09.18: A wire has a conventional current I directed to the ra5hb../5 xcki2sh0+1o d -*g3nptbdrfq kzax ight. At the instant shown in d.gb5tfir25a kh.b13n/s0 *k +z acoxqdx-phthe figure, an electron has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown gwrfidfb/*qto2 l :cu a;+*y9in the figure, which choice best describes the direction of the magnetic field at the point P located directly above tc l+ r :t;gf2uy9*q*oi/bawf dhe center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current I shown. A15jbq)b0yjsr h jd5c -t the instant shown, what is the direction of the magnetic force on the electron 1j0r-bj)hqsd5 cb5yj that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire r 8jjiq;ec4u7*y m9njas shown. For the proton moving toward the top of the page at the instant shown, wni*mc qe7ujy9j48 jr; hat is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight 7zqx i4da:+mdg5ob a. wire flows in the upward direction as shown in the figure. (Electma57gaqb+i:dzo4.d xron 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 particcq d uc tot1nyv3.-h80le with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. Tut cq nv8oct-01h y3.dhe particle will:

  98.10: A charged particlea2 gykmd; d 3z9 3 );6.v;ddmdcgmkxje with constant velocity enters a uniform magnetic field whose dirmd )g3gd;3 eakyc; zd dkm6j.v9dm 2;xection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particm o:v;rh9pm i5le of mass M is at rest on a table. A non- zero electric field E is directed into the plane of the ro5 mim9v:ph;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 non-zero velocit p j4 u4ds:x)td+bg5qpgd ,z9vy 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 directios4 jtpg:,zdgvd4+bd5xu 9 q p)n of the electric field in this region of space? Ignore gravity

  04.14: A positive electric char hj1u /*lszf fc5:xie*ge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acce5e/hul j1zffxsc*i *:leration of the charge caused by the magnetic field?

  10.26: An electron moving 7vppshe ;t; b3in 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 shown. At th;eht b3vsp7;p e 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 speed f dxy4 ozkb7 hfs-:)5b$1.00× 10^3\: m/s$ 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 izh7*s2d g.0yy a-qh 5 rtsmr/ln a plane perpendicular to a magnetic field of magnitude B. The electron fl st a y-02g5.qrs rzdmhhy*7/ollows 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 time?

  97.28: An ion with charldz2 f)6 fn b4fy(zqxqm p(26oge 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 unchanged, what will be the radius of the second ion’s f onfz(bm (xfp2)2l466qyqzd path?

  16.44: A proton moves in a ci +a:hemz/4 jzdor v( rp87pir)rcular 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 magnitude mag d8+ov rz:erpz7 4(i) h/mjrpanetic 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 perpendi/ +gy nlyvw;2hz0q:zicular to the same uniform magnetic field. The ions carry t+0g vy:q;/l2yiznhzwhe same charge and have 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 (o e7mfl86 4tb-mdko d: kkp(cmoves to the right. It enters a region of space in which there is an electricokdldomect -6 7:8(kf bm4 kp( field directed up the 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 and kinetex5e97vc2nq r6y8c wcic 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 elecd+c9k.hsdf)uv ez1- rn5fd: cie:j c:trically charged beta particles is commonly determined bc5jefezk: +9c uh v) id1c:nsrdd-:f .y

  09.27: A proton moves straight up the plane of th*ry 0,a,vcfpof* vi1 wis page into a region that has a magnetic field directed to the right. If the particle is undeflected as it 1f o,iwap*f 0vcy,vr*passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in tn:yi3s+;rhwi op8z4j he 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 in Region II. What is a necessary direction of the magnetic field in regions I anip 4zj:nis y+h3;o8rwd II?
Ignore gravitational forces.

  12.36: A positive charge mnthw jq:0 *8f *ep vfnl4e-nx8 bb-m)t ezgq5;oves with constant velocity through a region of space containing both ant)ff8zb;jqn0 nt 4-mb pev wn8 g5e*lxq:he*-
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 constp/: wqg/c- 3l bp/izl4puxy)vant 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 figl/p y v-i34qpl:/pbx) ugwzc/ure. 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.