09.18: A wire has a conventionk) .)dhp5g: a1 rncbpdal current I directed to the right. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic force on the electron at this ingak.p rp cd):1b5hnd)stant is

  14.24: For the bar magnet shown in the figure, whici *cvud7e24 nwu(fw *)uhjdv( h choice best describes the direction of the magnetic field at the point P located directly above4h(e2v7u u *fjnww udvcdi)*( the center of the magnet?

  11.34: A wire lies in the plan6 mw *y67bbtgs,d:sxfe 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 moving directly to the right toward the yt fmwbg:sxdb6 7,*s6wire?

  13.30: Electrons flow to the left in a wire as shown. For the wh83 qpu f0h g1,fb *z70lupuiproton moving toward the top of the page at the instant shqh 1h7,ubuzpf pu wl fi003*8gown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long strai (ay6l7iowi0o ght wire flows 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 directly toward it, the force on the protonao6 l 0wi(7yoi is:

  95.16: A charged particle with constant speed enters a uniform magnetic f8o/kggg/3r zkg g;k:tield whose direction is pe3r k:ktgzg g;g/g/8korpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle wizx*7xc2 ztg6fth constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. The particle wfzxgxt2z*6c 7 ill

  03.34: A positively charged particle of d)4cal*w pz/ inslb(b -, iku: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 direci4c)za: k -w bn u(dplisbl,*/ted 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 with constai4g sva jheb,j-: u4vb7rwa 20nt 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 is the direction of the electric field in this region of space? Ignore gravity7 a4-abr2shvv:g4 weiu,j 0b j

  04.14: A positive electric charge of negligible weigh(as wac 6,opw1xr,m (vt 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 b xamvww ap(6o,,c(r1sy the magnetic field?

  10.26: An electron moving in the plane of the page at an ax6yu5zu7 idl.l eui)6h5 +wqif a6y5jngle of 300 to the horizontal enters a region with a constant magnetic field directed qxd6+ y. wufiiel)7ly 6i5j5uz 65uahhorizontally 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 movek/keo5 t zg9 z6-(k5j,w2m i symc7kxes 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 chargepak -rrd 32man.h ,(dm −e and mass m travels at a speed v in 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 trav- p.mahrmdn(d ,3ra2 kels 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 cha*pt2 tvajr. x27)kzro rge 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 unchanged, whatx akrv.pot)2rz 7j*2t 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. Apj +f*,kre9 /pd bdz3q helium nucleus moves in a circular orbit in the sa+3dpr d 9ezjpb /fkq*,me 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 ton1 +ympybq*n- -etoo61bf)x w the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which b f pxb-e moy +ty11)o*nwn-q6of the following quantities must be the same for the two ions?

  02.15: A positively charged particle krb6k r.k0 y3hmoves to the right. It enters a region of space in which there is an electric field directed up the plane of the paper (see figure). In which direction does a magnetic field have to point in this region so that the partickk3 r60kybhr .le maintains a constant velocity?

  96.40: A proton of mass M and kl,nd0tjrx 0w5; 8zcerinetic 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 t-l9 60oj(hxepzel6 c,bt8seccgg (1 beta particles is commonly determined b e86x,clg(6j t0 c(pbeeglhz sc-ot91y

  09.27: A proton moves stpzl)sel5b 1u1 raight up the plane of this page into a region that has a magnetic field directed tlub e1)sp15 zlo 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 the plane of thmz.tn 1nji v d+0z0kr6e 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 page (as shown). There is 6+tvz0mnjz.1 r0ni d kno 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 velocit6xhy5ha ;mj2f;ma q(ny through a region of space containingjm a;;hf6a( 2 qxn5ymh 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 lvuz9-5e 5x bfwong 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 electric field that exist at the location of the elz9xuf b5ev-5w ectron? Any electric field in the region originates from an unseen external source.