09.18: A wire has a conventional current I direckbsclu(m5 (v :v8cv6mted to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electro(8:vsvmku vc(lc m56b n at this instant is

  14.24: For the bar magnet shown in the figure, which*p/1;sehb j 3dmc7bf..aaaq s choice best describes the direction of the magnetic fq. jh/abf;s37 cab*ea. s1 pmdield at the point P located directly above the center of the magnet?

  11.34: A wire lies in the pl dt 6ea94s*ymnane of the page with conventional current I shown. At the instant shown, what is the directio96ytns e*dam4 n of the magnetic 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 tg4j5f*pyip4 vubcg s rm1) 45the proton moving toward the top of the pagemr ysjpbi*c1uv455g g4 )tp4f at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the upward os rxd.0j+ z/6o)yzib direction as shown in the fig+j)d6bzxoz0oiry ./ sure. (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(v1:w yut m((d +i1zb1x jlacs speed enters a uniform magnetic field whose direction is perpendicular to t 1l(+(zw11sdav uyj:ix(bcm the particle’s velocity. The particle will:

  98.10: A charged parto tl e* kjhsr3;rc,cs;ln 9o-p84 i+abicle with constant velocity enters a uniform magnetic field whose direction jbsen *+p4 ;tol-c,r9lc3ha8ks o i;r is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M xholaa:oh53 ).3 ntlre8z 5ttj /5mdpft2 cp/is at rest on a table. A non- zero electric field E is da5 at3. 58leht xcrpj//to hfm 2tnz: lo5d)3pirected 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 particle $F_E$ compared to the magneti force on the particle $F_B$?

  16.24: A proton move /wum,- 8nkxkts 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 direut ,xn8km wk/-ctly 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 of negligible weight is released f 9+/sv;8e axzzc. cyvhrom rest between the poles of a horseshoe magnet +/s ycv zhz8v;9.ceax 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 the page athmiijbv5 *;8v61xmn g an angle of 300 to the horizomig8n5;vi 16v *bmjhxntal 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 the electron?

  11.29: An electron my n xixtez i7r-bn66yz 21ick* sm+,(xoves with 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 a1 68u x4tpu ew;cf sqe+dxivh/b;ku1v v 6d65ht 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 in8;qt +1vxuwh; s5i46xe b6vkedf u uv1d/pch6 this time?

  97.28: An ion with charge ktdks n0)ws3 6q, 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 bedk03)s6s w ktn the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field .;(xv l9qyg :wic r 9csd2tq-dB. A helium nucleus moves in a circular orbit in the same magnetic fie(yi2qgdw. 9 - vlc; tcq9r:dxsld. If 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 same uniform magnetic field. The io)nvz4 sbeex:nw hp3i.65r .sxns carry the same charge and have the same path radn34rxsxz6.p .vnsehb:ewi5 )ius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charged u5o/5dx isd4hparticle moves 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 does45 xhsiou /5dd a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M a (z)4(qs,b 6owbmo4.(uv zseozq:tg b nd 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 electrically charged beta particles is commonly det 4;mi.t krg 3imgznd+9ermined b3kg+ 9igz rd4.imtn;my

  09.27: A proton moves straight up the plane of this page into a regi:ii wf3 ls:i 1;uws4noon that has a magnetswiw1;43sonu fil i::ic field directed to the right. If the particle 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)ub;c3*tts 6kjt i- fq the 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 and II?q)uc*ts3- t;k jb6ift
Ignore gravitational forces.

  12.36: A positive charge :+jtjo - ikm-pmoves with constant velocity through a region of space containing both an -k:m- tioj jp+
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 long bkf9t1i-/zq w 8:pvoqy7 tv:q 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 o/: kvtt f71pvbq8qz 9-q iyow:f the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.