09.18: A wire has a conventional current I directed to the right. y7yek jppen;3-fckddnq::r 3x,0tu 1At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at3k d-efn7 ukyj: p;qp x:e,r 1ynt0cd3 this instant is

  14.24: For the bar magnet shown in the figure, which cr rx ys(gu v70x5jcn:rt -)vy7hoice best describes the direction ouxn g r)-jxsv(r yct 5yrv770:f the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plae(+fzo/y9lm5plmq ay(lg5u2ne of the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is mo5( (alel2 gfmpyloz+59um/yq ving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For b3n ok nrhb,3zvlon u-b:hwj. o*.v2-the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on theb n nho:l.3uvvnbr*o,-w2bk3 - j.h oz proton?

  94.30: The conventional current I in a long straight wirema1fy2yd t2 s7q,n0et flows in the upward direction as shown in the figure. (Electron flow is 272m yd0t1n t, aeqfysdownward.) 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 constanw/- m a;v3pfhft speed enters a uniform magnetic field whose direction is perpenhpvw a3/f- f;mdicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uzojq1 9tg 74siww;.koniform magnetic field whose direction is parallel to thwo 7 owkq4j.zi sgt;19e particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest a1j11 h+eiga von 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. 1+i1ev gja1ah 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 x4z24rkypui6mic3z. y in a region of space that has a uniform magnetic field directed into the plane of thc44.k6zmii 2yz urpx 3e 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 ch ojn/4xxtg(c 1:e i6moarge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of th46ci1:ngmxx(t/oej o e acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at an a *qf77 ri1+uf3)vi .flm r5 :hsemwmlqngle 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 omv51i s7qlh qff .:uim)+fw* 7 merr3ln the electron?

  11.29: An electron moves with speedypwo k 52ef(j,eb*hts,0md k 7 $1.00× 10^3\: m/s$ 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 mastge1w7j /o7mr s m travels at a speed v in a plane perpendicular to a magnetic field 1w7 j7t/roe gmof 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 in this time?

  97.28: An ion with charge qleu+:b:x g6z q, mass m, and speed v enters a magnetic field B and is deflectez 6uq+e: xglb:d 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 +9q. bw ;k -ie2fsyysycircular 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 magnetic force during its motion, what is the ratio of ty+f-y.;i9sskqewy 2b he speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the same uniform magnetic field. The io 5nz.y p)z*fy 0qjs/org;*:jm )etlerns carry the same charge and have the sapr.e 5y / r)j: m;zolefjsq*z0ty)ng*me 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 moves to the righ,cr if2 nompn4ucuk0kr- jk;;ff /;9nt. It enters a region of space in which there is an electric field directed upn; uk0o2k,/k npj fuc;f9crfri;-m4 n 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-,vrbl (o3fdupsx/g.m jf(6r 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 is commonly l j. it fi.stjvx.v18x-s7*nzdetermined bi s jxj.i-l.tf8 zt.sv nv17x*y

  09.27: A proton moves straight up0l lb3r1erpdaq n20 r; the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected as it passes through this region, iaprq0d3nle2b rrl; 1 0n what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron movey;uj6v9ugzm rxyh1 *;s in the plane of the page through two regions of space along the dotted- jyxr6; uhvgmuz19*; yline 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?
Ignore gravitational forces.

  12.36: A positive charge moves with covn5wro2o,eq50;vyvdd ai exst+/4 +i 2 kdoo0 nstant velocity through a region of space conta +/ivo40,adtre0v o koqdo52 n2vswdy5; +iexining 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 consqhbsg4t-/ 9gw/wdu 7otant 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 did u/bggtw7 4wh-q s/o9rections 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.