09.18: A wire has a conventionif je. ,)hr7zo.jn( vgal current I directed to the right. At the instant shown .r .fv7(i),h gzejojnin the 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 in the figuren9u edoq3 / hu2e)rj1p, slk/e, which choice best describes the direction of the magnetic field at the point P located directlyq)d/ju9sup1 e rln,23ek/ o eh above the center of the magnet?

  11.34: A wire lies in thebdq(fp;0j k z8 plane of the page with conventional current I shown. At the instant shown, what isqj0dfb z8pk(; the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to thefe4 h.(s z,hlu left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the pezh4( . s,lhfuroton?

  94.30: The conventional current I in a long straight wire flows in th,j/f ng 7 rn;ui,+dberm7b 9vre 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 directbr emvr9,ng,+f7 7dbni / ;rjuly toward it, the force on the proton is:

  95.16: A charged particle with constant speka9t3bp1 h 3nki d4;29v ocdpoed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The particle willo21ib3 kndp3pt;o9a d 9vkc4h :

  98.10: A charged particle with consta tfymm60w wv 95jccn/go*2 my/nt velocity enters a uniform magnetic field whose direction is parallel to the particle’s velo 9j*g 5oymmt6/w w2mc 0/yvcnfcity. The particle will

  03.34: A positively charged particle of9qli gtl5c1d) mass M is at rest on a table. A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field B l 9 dg5)lict1qis 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 1hkinuz./ k 0uwith 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 directly up thik0zun k.hu/1e 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 isl8. a* (j+m)y /*dkq:qarm cquwq y8jo released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the*(jqu+lq /mrca q* yjy8 q.a8k):owd m charge caused by the magnetic field?

  10.26: An electron moving in the pl blnhc4 +ej9l ss+kj1,ane of the page at an angle of 300 to the horizontal enters a region with a constant magnetic fieldce4+l ls +nbj ,k9j1sh 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 moves with sp z1z;6y:lefv.(zvs kqeed $1.00× 10^3\: m/s$ 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 plane pzpz3,v5 uqny+ *xrc.+l s9ys oerpendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the z oy*z 9,cn3u .xslrv5s+qy+pelectron 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 magnetic field B and 3 ,1zl: vcznzgis deflected into a pathnz g,31:zcvz l 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 w qo+ w.p)6x-krlrt fvg-)e;zcircular orbit in a uniform magnetic field B. A helium nucleus movolfew6 -x)rwt;qp ).rk+ zvg-es 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 helium to the speed of the proton?

  10.43: Two ions travel perpen4xuaq6w9 *zq tdicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in 69 xtzwuaqq*4 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 right. It enters a regid6/:4lfq);/ rchquv3 y mp dgson of space in which there is an electric field directed up the p43d/ucg q:dm fr); vq/hy p6lslane 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 max /+:wc.yqeb: u))hewwk, n pq(ajw6mss 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 determined bnr:ws f ia srd d( ,y.p;93vfgfkt9l6+siafvw;9 pfn rlg y:fdks ,+39r .t(6dy

  09.27: A proton move:hmgpn/laep . d rji6-;*-oibc prr( 8s straight up 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, in what direction must theapnmh./j p p -:-8grbi6;c*e (iodl rrre be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of thy v2qq 7o6s i k7)yicr6z6z*wxe 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 pyixz 6)wzrqc sv7okq*iy2 66 7age (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 constxwpqqj /z/nc4rg-p rve *8:5t ant velocity through a region of space containing both an r5 4qvw/j8 tpzp/xg-nq ec:r*
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 lojx57gc0fn,di6/ t d; zl6jzdttrli5/ng straight wires. The conventioz70; jc,5t/f/ dxl5zln 6it6 gidjdrtnal 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 of the electric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.