09.18: A wire has a conventional current I directed to the r tt4;b 2h1:u(jkin.u vqtb 8awiq:c 6kight. At the instant shown in the figure, an electron has a velocity di8.ikk (hcuw u q;4t:vqat6b1bi:n2 t jrected to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet s /mp-3nq :)wktp l/fut wjrl(5hown in the figure, which choice best describes the direction o)- qp 3(:5//twr k lfwupjltnmf 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 ) p)zu,l(o1bc f*jap g-obmh2I shown. At the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wgoo2p bubh)1az), lf mcp(* -jire?

  13.30: Electrons flow to; q5th0;hbke (elzkj(56 ih my the left in a wire as shown. For the proton moving towarkh5 6 emh (q 0j;5ilbtky(;hezd the top of the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current5kn k.kjh:cijtzhi57a .:6cs I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) At the instant a proton of charge +e is a distance R from the wire and heading dirj hct.i 55ka:ji k:zsknh7.6c ectly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a unifo1o7 0k;a yqr+s6mnqj yrm magnetic field whose direction is perpendicular to s0orm+7n;yjq q 16kyathe particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a unifou cud f7ox6wgfqc,9wd44h97 qrm magnetic field whose direction is parallel to tqc qdwfu9udx cfow7h, g64974he particle’s velocity. The particle will

  03.34: A positively charged particle of 2jwmg2vk.ae79grkx:f4; (siq7 ou f emass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A 7or:2i;k e4 f g9sxfa2gv(e j kmq.wu7non-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 wis s*joyots13(ps8 arf)k 3m+fth constant non-zero velocity in a region of space that has a unifor1ps)3ms fj+ o rykota83*ss f(m magnetic field directed into the plane of the page. 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 of negligible weight is released la z(b(81)f1geni fwifrom rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the mae)zl1( nf1b8 fgw( iaignetic field?

  10.26: An electron moving in the planeh; bes3 wd ;oy42tf w dk:o/1jgsegh)7 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 the instant that the electron enters the magnetic field, which best describes the direcogweo7;sw e;kyf / :d2b3s4dj)hh1gttion of the resulting magnetic force on the electron?

  11.29: An electron moves wizs08v,p ihs 6o(y5kghth 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 in a plb0q zu6*itj1p,flm wv 5s3/dmane perpendicular to a magnetic field of magnitude B. The electron follows a circulaw0f z1s/qm6td,j*3b lvp m5ui r 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 charge q, mass m, and speed v enters a magneti7h egar.p ob)*z/8vyrc 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 secovbyo7r8 hzr*g /pe ).and ion’s path?

  16.44: A proton moves in a circular orbit in a unifg- )mj23k cc/dmhbn1porm 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 of the speed of the)bj- k d hpc2gm3/cm1n helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The i4v0e;-j3 3ts 2,gqah6ay wsxa g7khfb ons carry the same charge and have the same path radius in the mag-w7033 aq,yj;s4hbav fgtghe6axk 2snetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively ch8v axkw(y +iyr5m.9vkarged particle 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 doeai.yvxky95 v mw(+kr8 s a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mas,c; lniq9.f+ms-dw afs M and 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*e )1ptohwm ba3uqbtj-i3f 09 is commonly determined byah-3pbm t b qj)*o wi3f0e91tu

  09.27: A proton moves straight up the plane of this page into+ql p13s paxgg: :1ljv a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, in what direction must there b3 g+a:: pxjg1lvls q1pe a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page through two regions of s7, ae 2ot:k.yg k*h hb.qhttv9zbiq, 3pace 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 Reg:o92b.yh vie z, bktka 3h*h.tq t7qg,ion 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 jcqo/9 *p0v48h+ajke6rcef m velocity through a region of space contaijeoj +0pm*9kcerha/v 4 86cfqning 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 non-zero velocity directly between ff2uzv2;nt dk0go z//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 choice best reflects the direction of the magnetic field and the direction ofgn2 t d; z/0foz/ukvf2 the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.