09.18: A wire has a conventional current I directed tondi )2xxg9i z; the right. At the instant shown in the figure, an electron has a velocity direc nxgi9dzx i;2)ted to the left. The magnetic force on the electron at this instant is

  14.24: For the bar magnet shown in the figure, which ch*vlfji tvb qn6e50gv 2784x8qg sd3bcoice best describes the direction of the magnetic field at the 2btl7vjq8gsi4n6* q 8 5bvxed0fvc g3point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of the page with conventional+enz;ruy 7uov:o2eu ;no -g b: current I shown. At the instant shown, what is the direction of o;-:2vo;+ye7on nzbe :uguruthe 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 proton mo kiwnh/. elf:0fz- ns-ving toward the top of the page at the instant shown, what is the direction of the magnetic force -/lni fzwsf:-keh.n0on the proton?

  94.30: The conventional current I in a long straight wire f m lqgmf quj l;e3j6s)ley)9dl7* f(.plows 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 l)u)dqmlsf p gmljy*e3(;lq69j7e f. heading directly toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a unifo:5. lw9i*bitbb:xw yqrm magnetic field whose direction is perpendicular to thei95qtbwb :bwy l*:i.x particle’s velocity. The particle will:

  98.10: A charged particle with constant velocity ente*x/ spqgc k;y kxxl*53rs a uniform magnetic field whose direction is parallel to the particley* /lgc ;k3xqxx*5psk’s velocity. The particle will

  03.34: A positively charged 1 hvnkf(6xq4l,pew a7particle 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,( qw7pvfe1 l6a4x nkh 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 constkg ,1 m w lmuv*dl34pif 2(g 0grk3cv.em9go,oant 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 electr 4m *,0dpk3vlk( v1gg2c3igoowl.efm9um,gr ic field in this region of space? Ignore gravity

  04.14: A positive electric charge of negligi)p0xpas -rw;ucke9kw62 z-j ible weight is released from rest between the poles o 0x9-2ks ;p)uwjr cp6i -zewakf a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by the magnetic field?

  10.26: An electron moving in the plane n60lrd68qg 457qyqqyavz h(fof the page at an angle of 300 to the horizontal enters a region witr5n q 7 gy f6hl40z8qqvq(6dyah 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 mov+c,+ 0 ct+sprrvksvv)t (o+r des 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 charge −e and*p5nhdnmn oz.79 2zzu mass m travels at a speed v in a plane perpendicular to a magnetic field of magnitude B. The electron followzn*9no7zu5mpz 2 d n.hs 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, mass m, and speed v enters a magnetic fie (cxf1n ) ebsmgxlqs6 3ib7,w4ld B and is deflected into a path with a radius of curvature R. If a second ionc3es b n(q4fw mxb 7gx61,li)s 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 ov:iry7 )/ cie.a zrtcu 4ir+w9rbit in a uniform magnetic field B. A helium nucleus moves in a circular orbit in the same magnetic field. If eaceviyirru+)zt:r/c9cw7 ia 4. h 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 perpendicup. qjbpt:g,m) f*it9 u+gew1wlar 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 must be the same for the two ions? +: wgp.w j *q,tfpemg9i)1tbu

  02.15: A positively charged particle moves to the right. It enters a region of q5ub)c )vkbo (c-e/sd space in which there is an electric field directe/k( cqs )bv- e)cud5bod 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 kineti1 boq +xk*zr,bc 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 kdxi hk,vc4u816v pro81,jl fbeta particles is commonly determined by84dk cvp1 1r,,juxkil6h8f vo

  09.27: A proton moves strai7lytuahym8x7g- o- ) wght up the plane of this page into a region that has a magnetic field directed to the right. If the particle 8a7 7yxuml) -h ytwg-ois undeflected as it passes through this region, in what direction must there be a component of electric field? Ignore gravity.

  08.36: An electron mo :z+ b7werdkaae, jz77ves in the plane of the 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 no electric field in Region II. What is a necessary direction oaze kw77br da+j7z,:ef the magnetic field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge move ztggm-4o2y4cs with constant velocity through a region of space containing both g4gtc-4zmo y 2an
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 veloci 6m2xgtab3i -ity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite directi-tmxa g3i 6b2ions 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.