09.18: A wire has a conventional current I directed to2f2o.z ru 1,)k qehcjc the right. At the instant shown in the figure, an electrof.2quej1oh)z, 2 cc rkn has a velocity directed to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet se+ skf*he awq)mwg +sm:.97pdhown in the figure, which choice best describes the direction of the magnetic field at the point P locate +mfea kw h:)g* espq7s+w.m9dd directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional current z9g,r gf7hs)s ;vjc q+I shown. At the instant shown, what is the direction of the magnetic force on the electron that is mo) gz9h;cs g,q+vsrjf7ving directly to the right toward the wire?

  13.30: Electrons flow tb )fv 0:ujnnzz:7d(), y ifv ey2dq0ruo the left in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction ofbn 0i uy )yvj7 :u(evd),f0nzrzqd:f2 the magnetic force on the proton?

  94.30: The conventional current I in a long straight wire flows in the up3x(b g.uvjri3 l7no9x d-osb/ward 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 hojb/ d(iu on93xxbv- gs.7l3 reading directly toward it, the force on the proton is:

  95.16: A charged particlm8fu1 6cs*md 4 cug;gpe with constant speed enters a uniform magnetic field whose direction is perpendicular to the particle’s velocity. The pa4su gcmu c8fpdmg61 ;*rticle will:

  98.10: A charged par:90nrnu5+ sutgc f0bd:dhsw sb.2 ,ycticle with constant velocity enters a uniform magnetic field whose direction is parallel to the :c 5wrh .f+ 29ngsb tud:0b,cd 0nyussparticle’s velocity. The particle will

  03.34: A positively charged particle of mass f1:2j5qib4 l c(l whgkvun96c+xf7wmM 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 t2 9cwl cbv(h wj7+iqgkuf nx1 4fm5l:6rue 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 velocity in a r3lvaj.3wty ( ( c7mmivegion 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 is the direction of the electric field in this region of space? Ignore grav3 l.i yjmwta(c(7mvv3 ity

  04.14: A positive electric charge ofs0 a6.qd.2-qq q nsixt 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 charge caused by the magnetic field0 qi.x- nas.tq6d2qqs?

  10.26: An electron moving in the plane of the page at an angle of 3td 7iy6b;ue:x c;gex) qdz 8lx13tp,w00 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 fd, e)z1bxy8 3 gxet ltd; qc6wi;7uxp:orce on the electron?

  11.29: An electron moves with s9rrhg)xk(9 64m v jfgdpeed $1.00× 10^3\: m/s$ 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 r ,4wp7 d/rxy5ioyfl)h3 uf8qin 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 in th) iph8q ,ru3rxd7fo4ywf y5l/is time?

  97.28: An ion with charge q, mass m, and sm wky6d+i73wv8ki/ zvam1 b 8bpeed v enters a magnetic field B and is deflected into a path with a radius of curvature R6im 3i /w78wbyaz1m+k v8vbdk . 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 circular orbit in a unifor7qx dxlvv 8sh1ku i*l+s f itv8r8a-./m 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, w8ha7s8l u. kflv8qv-*+s xt/xr1vii d hat 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 1cml8zdeypp)d16/z.8 9l wvlemdqf2 , qmo*x ions carry the sy2z61 omd ,dl81 vp)l*cmze dqxw /q9emfp8l.ame charge and have the same path radius in the magnetic field. Which of the following quantities must be the same for the two ions?

  02.15: A positively charg1lrm9cl h- 8sr4lgoh, t85sxaed 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 548 alo t1xlsclh9grs8m-h,r (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 M and kinecb 1xhmk*fsl omt95u** e ed4*tic 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 chayzln km)0cdy :g/xo/;rged beta particles is commonly determined blm;/zxcd )gk:o /y0yn y

  09.27: A proton moves st/qk 09wxwrii.raight up the plane of this page into a region that has a magnetic field directed to the right. If the particle is undeflected a ri.9i /0wxwqks it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in tg 6llri+ ;gqs;he plane of the page through two regions of space along the dotted-line trajectory shown in the figure. There is a6gg ;ril;sq +l 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 veloca;4 ut. coenojo,3+flhs8ap 8ity through a region of space containing38lto+a nu j48e.so;,pc ahfo 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 g4z ky8xj934 3nhv7 pgkfxu +qbetween 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. 7gjfh4k+vxy 94zgn3xu3 p q8kIgnoring 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.