09.18: A wire has a conventional c fbow0zpq.3o2 urrent 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 th wz30boqf.2p ois instant is

  14.24: For the bar magnet shown in the sjinv )p5q)d0 bb+ ;rffigure, which choice best describes the direction of the magnetic field at the point P located directly above the center of the magq d+ )nf ri0pvsb5;jb)net?

  11.34: A wire lies in the plane of the page with conventional current I showu.0tt 68sy zmw- lwfu.+sn -ntn. At the instant shown, whas wf-.8 swtunm.zyl6u tt0n-+t 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 left in a wire as sho,rd7/a dmff(oym/b u6wn. For the proton moving toward the top of the page at the instant shown, what is the direction of md fa(duyr ,7//o b6mfthe magnetic force on the proton?

  94.30: The conventional current I in a llub s 799i,tsdrjxlym0.87moong 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 directly tsy.d 90bi lr7 8lm,t7js9oumxoward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform d, slm5knn o ;ye9-fq9magnetic field whose direction is;fnn,d- qk9sy9eo5lm perpendicular to the particle’s velocity. The particle will:

  98.10: A charged particle with k dr+gq0y;rd4t7a(rdconstant velocity enters a uniform magnetic field whose direction is parallel to the pardt y r( dk+r;g4r7a0qdticle’s velocity. The particle will

  03.34: A positively charged ybz:762 x3suba1 do6xk9xj ox 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 o7:x6bx 9z2j3 ob1daxy 6xuskdirected 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 veln(5(k d bre-dlocity in a region of space that has a uniform magnetic field dib-r k(5dnld(e rected 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 rb9p5j43v f4 ecp:jbvdeleased from rest between the poles of a horseshoe magnet as shown. What wo3: bvv54 e49dpj jpcbfuld 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 anazpg0 80n ipzpqw6nx)7. 2pb c angle of 300 to the hori i0pnz7pp268 xnwgczpq0)a .b zontal 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 the electron?

  11.29: An electron moves with spee17 ioppwo jr ocp97d44d $1.00× 10^3\: m/s$ 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 cpmbriw cvbvut,;/uei9* 5m/4oa 4 / eperpendicular to a magnetic field of magnitude B. The electron folloert/ 5meiivb* p/4 ;vc/m,bacwuu 94ows 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 charge q, l xg)e:x tum/(u+h 8domass 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 sp+odh u(g l/x:8t)uexm eed 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 0-ntgwr t b ;cad83i7ka uniform magnetic field B. A helium nucleus moves in a circular orbit in thi3;w cna t8dg7kbt0r -e 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 uniform magnetic dm8v h7k8o dg0field. The ions 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 twm dd8 7k8gvo0ho ions?

  02.15: A positively charged particle moves to the right. Itr/gq l)-,j(jnx pp9zq 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 mzg-pnx jqjpr l9 q/,()agnetic field have to point in this region so that the particle maintains a constant velocity?

  96.40: A proton of mass M and kinetic energp+- pnpuy5wq -91rhwlqgpc) 7y $E_k$ 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 isau ktxg(po 6.g qk.z*jr::h4j commonly determined bu ag. 4(gro::h*6.pjtxzk kq jy

  09.27: A proton moves straight u,cfw rlk71 b+6yz4a8 d uaw1gop the plane of this page into a region that has a magnetic field dir1df wkaoc7l 81u6gy, w+b4zarected 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 *h5er/ysgea-flsa// vy 4qk- 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 no electric field in Region II. What is5kelv ryss/aqf-/ ag* / 4yh-e a necessary direction of the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with constant velocity throu.:imeit78h3b7,eh;tif 0 m9q vaeb zvgh a region of space containing both an qvf 0e8av3i,iiehhzb;t7 tm9 7em:.b
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 con6wl8;i)jox4 xd h7o y41xoeqestant non-zero velocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directions as d1e;x h 8xi4qwoxjleo6o) 47yshown 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.