09.18: A wire has a conventional currentsckc5njbd-iz( 8. plqymm 5am5bo6d3 fl.-3c I directed to the right. At the instantdibfbd5asc3- m(5kmozmql j3l8p-.yn 6 c c5. shown in 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 figure, which chrhx+b 2e.n r4wmy/ su0r kl89doice best describes the direction of the hrxylnr9+ r2m ds k.8/bue4w 0magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane o,*t*jjdw r(w uf the page with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electron that is movingjjruw d*(t w*, directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shown. For the proton moving /)y .vjzc7 wah:wof 8jtoward the top of the page at the ins.w7 ajzvhyfco )j:/w8tant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire k 7vwyrvnd)(7w5t l4kflows 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 direck 7wlr54yvvd (7wk)nt tly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a unifklesd(y f h-d-u(wl*) orm magnetic field whose direction is perpendicular to the particle’s velocity. The particle wil -()hf *uswy-e(dl dlkl:

  98.10: A charged particle with constant velocity enters a uniform magneti 7/ ,:wmfwwotlffgf36bj1cl87e p *nec field whose direction is parallel to the particle’s velocity. The particle tf en7 lgf w1:lwm7e6 3c*ff8wj,p/ obwill

  03.34: A positively charged particlpp(g.t8mx:ft e of 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 is directed out of the plane of the table. What is true about the mag mg t:.fp(p8xtnitude 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 d :6wr9 vq*nw mq9 cdcbrag+(: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 the plane of the page. What isdb:crg mnr9w ac(:6wd*9+qvq the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric ccm71 k26- fn:t jjr,vimgygv :harge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the chm:7j6cgtmji:v 2k vg 1f r-n,yarge caused by the magnetic field?

  10.26: An electron moving lq3gb01.f udkk2gmjad 2cb)7 in 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 the instant that the electron enters the magnetic field, which best describes the direction of the resulting magnetl7 0)cu123qd2abgbj km kd.fgic force on the electron?

  11.29: An electron moves p: ofo(jr 0m;gv59ius 4vnml+ 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 at a speed v3 3b5q1kw8js.) fgb:ckofuej in a plane perpendicular to a magnetic field of magnitude B. The electron follows a circcuj q8 ke: kfb5fs.j3 b)o1w3gular 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 vxg*c;8 3xhwp b (d+qmpzj.hw. enters a magnetic field B and is deflected into a path with a radius of curvature R. I(wp ;+. 8md.3gxhxzc*hq pw jbf 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 circular orbit in a unifo6o;k )gus+ g)aibv3m jrm 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 smi)av)gbk ; o6ugj3+ speed of the helium to the speed of the proton?

  10.43: Two ions travel perpendicular to the 7ltiqz- ix+,jsts;i31h t n:1ko pwr0same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following qu; :lr-iontshsitq z i7x1w0+jk p3t1,antities must be the same for the two ions?

  02.15: A positively charged particle moves to the right. Ih3) +dfvtp9j pt enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction d3jvft d9)p h+poes a magnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M 0;8 o.lch gfyels y0.bqn0s;wand 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 determinv 5vmms8hm(ql ,+.wvxed bmv5 l+xhvvw ,m mq8.(sy

  09.27: A proton moves straight up the plane of this page into a regionn6: hp*x lkg4x that has a magnetic field directed to the right. If the particle is undeflected as it paghx*p nk :6lx4sses through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in the plane of the page ths4o ad /dwzz 1vw9x92erough two regions of space along the dotted-line trajectory shownwze o4 a1/v2 szx99wdd 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 constant velocity through a region of-z h(d(o nq r:;e-sbto space containing both an s(r( -;o-dhq z:oebtn
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 betwee94*a1+w3bqzlzafmsl o o:ycp. y40at n two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite di.*1la zwql94to s :b0z4aap o +3cmyyfrections 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.