09.18: A wire has a conventional current I directed tof,na 4n(/ )9ontots nk the right. At the instant shown in the figure, an electron has a velocity directed to the left. Tnt ntno/,)9ansfk(o4 he magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the fip3o in6rge21zgure, which choice best describes the direction of the magnetic field at the point r136og 2peinzP located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventiona7qwl j68bge: i agwfu(822z8ajp8qw dl current I shown. At the instant shown, what is the direction of the magneti8 wpgqd iwgae82(u6 8q f87wbjjz: l2ac force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shqpbvw-17t bo*qss)d6tg. .g7i;rqw town. For the proton moving toward the top odqwqb.g-7i w *7;bospq.)vt g6srt1t f the page at the instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a lha*noyp4/32 j1ih decpjb16mwe1xy3 qr5gt1 ong straight wire flows in the upward direction as shown in th4ycban2oh1j 3tim1dp6hj5 / ep3gq1 ew1 yx r*e figure. (Electron flow is downward.) 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 constant speed enters a uniform magn(4,zrzv-gpo lgeg9dwu, 7; xuetic field whose di,zw7-d; g,rxg4 9vluuzgoe(p rection is perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity enters a uniform magnetic fie*ypgw;g/0hun,kq. g+ooym rn1xf+ 0q ld whose direction is parallel ton0n1qw, +okg *q0m./; p grfu+xgyohy the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a tablebkgue p,v(bd4faf2p,c8z11c . 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.v1c 1, 4dfb,pc2ueak8bpz(gf 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 velocity in a region of ikpdtd k7y9c;t( s /+hspace 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 thedc9 (ti sy kpkd;th7/+ direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electric charge of neglhkwpadlft-1 xhqfrr w) (h,7h7 9s :o/igible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction off sh,thf/ dkwaxolr 17 qpw-)(:h97rh the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page ai xe1nlk 9g+z+t 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 magnel +e1i kzg9x+ntic field, which best describes the direction of the resulting magnetic force on the electron?

  11.29: An electron moves with sp5md ipl /t v55vyj n7ua;stb8g0s6fm4eed $1.00× 10^3\: m/s$ 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 pvvy4cp 6+ ib04aqlv1ki7 2b9 uq mvk/olane perpendicular to a magnetic field of magnitude B. The electk u6kp+ vovaqbm7q9v4c 14iy/v0 i2bl ron 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 cs vx .qggo+3wk7pid+c) (n1gs7lr. 0. pimidfharge q, mass m, and speed v enters a magnetic 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 unch7gpgl ik .sixwfp .d.coqi7dg0s+ r + n()3mv1anged, what will be the radius of the second ion’s path?

  16.44: A proton moves in a circular orbit in a uniform magnetic field B. A n xup-wj2jy/,n5z 5zzhelium nucleus moves in a circular orbit ijwjxy 5p z5-n n/zzu2,n 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 perpendicular to the same unioe0x9 hf7 o-zgform magnetic field. The ions7hgozo9f0 xe - carry the same 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 charged particle moves to the right. It ente r-2 ). uzykh5 ab01lirxsxah(rs a region of space in which there is an electric field directed up the plane of the paper (see figure). In which di ) 0 1zslauhrx(xrayib2- 5.khrection 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 kinetic energt/plkt* vw --e woo/15b1 lc0 l:eeutfy $E_k$ 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 c bme p*1cuhk+a0ry( 3p0;lkpdetermined bu*ckh l y b(k+;m p1r00ppae3cy

  09.27: A proton moves straight up the plane of this page into a rtd(6ro h)n6 gregion that has a magnetic field direc6to6dn h (rgr)ted to the right. If the particle is undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron moves in thrhqg.k;qszz kdk42pbt,0 /- y e plane of the page through two regions of space along the dott szb2/ktpy;,qgdk0z q- 4rk .hed-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 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 /r qq 36,akppga region of space containin ,6par3/ pqqgkg 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 two lonv9ky( m7z8 y*eq/ctqk2 p/rugg 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 of the electtzqp8 y9 2rcueky7/(* mqg vk/ric field that exist at the location of the electron? Any electric field in the region originates from an unseen external source.