09.18: A wire has a conventional current I directed to the rima6x1l x (+z th 6,;svdyq9aagght. At the instant shown in the figure, an electron has a velocity directed v1ydxg,a; 6 (ql6ahz +sa x9tmto the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice bestn3o . baeur2w2 describes the direction of the magnetic field at the point P located directlyw3b raen o.u22 above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional );)ynajg .jfio 1vgj)7ww ik0 current I shown. At the instant shown, what is the )0fywg) ;1vwji k)jja7iong .direction of the magnetic 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 shown. For the 2jgrqity q))4 proton moving toward the top of the page at tyi grt2 jq)4q)he instant shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional current I in a long8aeflu4s r pg2ip j4,v;)tz+pr,imp, straight 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 i jpa,l+p4mest2 u ,,fi8grrp;v) 4zp directly toward it, the force on the proton is:

  95.16: A charged particle with constant . 5 6fj;);v awp erz-af8wjqse*r+ scwspeed enters a uniform magnetic field whose direction is perpendicular to the partcr*p5w6saezw qs .vjj+ ;f r8-a)wef ;icle’s velocity. The particle will:

  98.10: A charged particle wis9 qyeiu)k0 j7th constant velocity enters a uniform magnetic field whose direc 9 k)j7esuqy0ition is parallel to the particle’s velocity. The particle will

  03.34: A positively char 12sfnl3r:w ffged particle 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 n:rsf 2f 31wlfabout 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 space than 9oqh-u4 u08ah d.gnngu60i:hg m3p ft has a mn9hgi-:.40u6nag0h upqd o8 hgnu 3funiform 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 gravity

  04.14: A positive electric charge of negligible weight is released from rest b/o8;x6xaj b kkrjatpe 5,/* zzetween the poles of a horseshoe magnet as sze xoa,rpb*6 5;x/j k /a8zktjhown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the page at ab7 be.tt lb7d y)zx*.cn 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 magnetic force on yxb.dczb t.b 7 et7*)lthe electron?

  11.29: An electron moves wir x f .tpl 4kgv7iw0/fleh;:(bth 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 v in a plane per(retfv90tnfbwa lpri/5 68ov xmi6 p -.9(hdapendicular to a magnetic field of magnitude B. The electron follows a circular path of radius R. In a time t, the electron travee./orh0 i5 btdmfv 9p i(6-rxp8vlaaw f 9t6(nls 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 mhe2ji xzs). c4ajbb: n2a :t1ragnetic field B and is deflected into a path with a radius of curvature R. If a second is jh)a:a etnbz ji4.cb: xr122on 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 upj g:;udpsi)i9 v;ng7niform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experin)7d:;pi9pu s;vgg jiences 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 perpedjk tgf/:ydz1rrqs4ue,7fvi/ 3fa,,3fl u4 jndicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the mra3qig3 1zj4sjlevf kfut// y:,,4dffdu,r 7agnetic 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 region rojjk g1tr*70rgeo93cog8r zry;/ -yof 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 0og rj9k-er / o83j7 ocrz;rtgy1r yg*region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinet1vh i dksr 43aa743iajic 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 chargedq;eji 8x:s8bj d1y+xm beta particles is commonly determined by;qd 1i :s88m+xbx ejjy

  09.27: A proton moves straight up the plane of this pagdsacff4 : 7g8 1*hnk:gyn+ieke into a region that has a magnetic field direct 8 f4:+n*kie7kng1s :facdy hged 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 the plane of the page through two reginkie6- m8 ed/pons 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 no electric field in Region II. What is a necessary direction of the pmik8e/n ed- 6magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity through a region ofq50q -spd+w si;0gwjk5fu5u.)lb f f u (b6icq space containing both i5kf;-lusq)uc0bq u05 j qb .gw+i5 f wdfsp(6an
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 4vsz3r96 *a*e sogi v,mi( xeylong 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 electron? Any emi y4srs93(e6x*gv*e a zoiv, lectric field in the region originates from an unseen external source.