09.18: A wire has a conventional current I direia2 wk04 u fl7 ioa/y-v-rj*mxh )v5eqcted to the right. At the instant shown in the figure, an electron has a veloci- hl fa0/*io mr vjv5ayi)-u74k2wqxety 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 choice best dip swmsn3m2) l9(ewu1 escribes the direc)pnwm ss ml uw2i93(e1tion of the magnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the pnoc)dwp yzk *xh5,z6+age with conventional current I shown. At the instant shown, what is the direction of the magnetic force on the electzkhw6*5d np),oyc xz+ron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the left in a wire as shcmzadz 8m ,sj+( c57hiown. For the proton moving toward the top of the page at the instan7ci (m+z,d8jcsmz5 ha t shown, what is the direction of the magnetic force on the proton?

  94.30: The conventional curre7(kz1skiw57 rp rct9e nt I in a long straight wire flows in the upward direction as shown in the figure. (Electzrpr(wks97 ce1i t7 5kron 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 magnetic z8 tdi;/v q ,vzo-ux+vfield whose direction is perpendicul;+v8 ,o-v tzzi x/vuqdar to the particle’s velocity. The particle will:

  98.10: A charged particle:gz z:*ea1(e- qw chdm with constant velocity enters a uniform magnetic field whose direction is parallel to the particle’s velocity. Th:h-q mcz gz 1a*e(:wede particle will

  03.34: A positively ch eaj.bdc* 3)e 0o ,dopnhh79kwarged 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-zerook . 0hejc3,nd wo97 *)bdpeha magnetic field B is directed 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 constant non-zerv/ /yagyo dv9,mh81kdo velocity in a region of space that has a uniform magnetic field directed into the plane of the page. The proton moves directly up thkovyh,dv1aymg 8 /9 /de plane of the page. What is the direction of the electric field in this region of space? Ignore gravity

  04.14: A positive electri.75vwjv aa1s cmte+mjl . )r4lc charge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleratio1a7v.)t4.lvj rmcam +ejw 5ls n of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the pagfl9hu t7/t;tle at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontally in the plane ht9;u7 ft/lt lof 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 moves with speed t cib4a6-rn8y+icik. $1.00× 10^3\: m/s$ 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 s n :2(e5b-/fkh7vdarqesu2m 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 ns2edak(q :2-e u h/5sfr b7vmR. 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 cc01+ lkd hbt)zharge 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 ionlhzcd)+0k b1t 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 circularc6v n7bq2u jz- orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If each particle experiences the -zqjnv76 bc 2usame 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 :rm.f) q i06.mxvb -kndsnu0tperpendicular to the same uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities mustns-u mq nvr 0 .m0b)k6:dx.tif be the same for the two ions?

  02.15: A positively charged particle moves to the right. It enters a region ofpz r26md; bwi++g ri 6zs ko19zu82qsp 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 92zqg+szb6s2rikum68 i;pow+ zp d1rthis region so that the particle maintains a constant velocity?

  96.40: A proton of mass M anye bvsh+6 h92sd 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 eleygpg+fqxc 6fw, x0w 2/ctrically charged beta particles is commonly determined byw ,cpf2yw0x+qg6f g /x

  09.27: A proton moves straight up the plane of this page into a regp u :ccst wrl m5; pk,r,eg,un/i)ea4+ion that has a magnetic field directed to the right. If the particle is undeflected as it pkcpp,5 ewrs,)tm +ie g,uun: rac/4l ;asses 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 i70s8a xg pm i clu3p2-6,f.fq dkz22r a+mltltwo 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 no electric field in Region II. What is a necessary direction of the magnetic fie28mapfz ra qx +k0d6im-3 p slt7l2.glfiu c,2ld in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge 3w8qgd-fo2+mg *jalj moves with constant velocity through a region of space containind*qo-l a2g w+j gm83jfg 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 betwe* 5wzs;zw+s5i 8niu vmen 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. Ignoring gravity, which choice best reflects the direction of the magnetic field and the direction of the electric field that exist 8i n5s*szvwz5uwm;+iat the location of the electron? Any electric field in the region originates from an unseen external source.