09.18: A wire has a conventional current I directed to the rightfa76jxatji/ kx )0f* rrg - mm)byy/r5. At the instant shown in the figure, an electron has a velocity directed to the left. The magnetic f5ja* mfa6 tfr/rr0xb)-xm/ 7 ykygj)iorce on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which choice best describ j4++:v02yz ecba rkvxes the direction of the magnetic field at th4z2 a kxbe0rj+vc: yv+e point P located directly above the center of the magnet?

  11.34: A wire lies in the plane ofeo +1kxkkkk qcjtf3u*; lhwa1f :18d, the page with conventional current I shown. Atlq:f jk k;8k tue 1+xw,f3c*1 hkoa1kd the instant shown, what is the direction of the magnetic force on the electron that is moving directly to the right toward the wire?

  13.30: Electrons flow to the lef cij s7yx /y4*-/ mo6xnwyims4t in a wire as shown. For the proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force o*im os4/ 4syx j6x7/nc-iwmyyn the proton?

  94.30: The conventional current b9lojtqfbi/ dbgq c,580dy)+rhz-v 1 I in a long straight wire flows in the upward direction as shown in the figure. (Electron flow is downward.) Atdl05vcy,-t r 91+bq/zibfqjog 8b )dh 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 73nv;zo*v/v wzgmyq )h+2lisetic field whose direction is perpendicular to the particle’s velocity. The partv2+ i yz/n v;vwh7)*lqmsgo z3icle will:

  98.10: A charged particle with constanctdacbthl6 fe i4383 0c hnc*3t velocity enters a uniform magnetic field whose dihc60* cetl bt3 di 3hna8ccf43rection is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at r05vsw ,:apcg best on a table. A non- zero electric field E is directed into the pvgwbcap:5, 0slane of the table. A non-zero 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-zero velocity in a regi*57b-vm61gkcfw eruv b m21j :x .qophon 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 regionc*hmuvj rg:1x .v7 e-pq f 2obk6bm51w of space? Ignore gravity

  04.14: A positive electric charge of negligib hiuzy)k18y9s 5lp /ohrpd/v3 le weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction oflz uh3pypd/iy)v895 o1ks/rh the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane of the q0l9iz )zffe1+krvx,page at 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 thatez,v1+0kfx fq l 9)irz 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 spee 5z ox2u)awq+8f)tf dgd $1.00× 10^3\: m/s$ 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 s6d(rva4.zro+ y3o8 aoad ul34eh bdov5lbf . )peed v in a plane perpendicular to a magnetic field of magnitude B. The electron follows a cio445ur .l d)d+ovo oha6 adblv3.ayz(re3f8brcular 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 cha0au55z: d ocwhrge 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, woauh5z :w0c 5dhat will be the radius of the second ion’s path?

  16.44: A proton moves in a circu, c 7zv n,): 5mhjhyeqdu)9skalar orbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the sz5 s))y9 k,eq a,hdh7cmnj:uvame 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 samkd;kc+ gxhqirza.6b xe1 )9i (e uniform magnetic field. The ions carry the same charge and have the same path radius in the magnetic field. Which of the following quantities (a)i6+x. zrkckieq;x1bdg9hmust be the same for the two ions?

  02.15: A positively charged particle moves to th2 t w+. hheo1sga3wd.ie right. It enters a region of space in ea2hohi1s+.wd.g w3t 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 particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic ene zjapnwml: d(nu6p3.+ rgy $E_k$ 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 c(3)) nszt muoiharged beta particles is commonly determined by tu3no)z(mi s)

  09.27: A proton moves straight up the plane of this page into a regkppkq -1+8y qmion that has a magnetic field directed to the right. If the particle is undeflected as it k+qp-8ymqp 1k 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 regions of space7us 8sn7na4d v1 nzw2v 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. Wha1 nv4swz7 a2nv 8ndu7st 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 a 9j elp 6 fh3wlo 66hlttc3t)+kregion of space conp6hl)f 9oc ekwlt l3 j3t+66httaining 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- tx ov 6xgpr7,iy1mj3vz4 di i,cs(2k2zero velocity directly between two long straight wires. T64zig mpjoi2k7,vdtri x 1sc3 vx(y, 2he 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 electric field in the region originates from an unseen external source.