09.18: A wire has a conventional curren7i;oh,p8fxt *)jgsx o t 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 att; p8o7, gx*ijx)f osh this instant is

  14.24: For the bar magnet shown in kg rg9*:4p u(7cer j6c(ncqv dthe figure, which choice best describes the direction of the m rcr( 9c4endu*v6cq kjg7g:(pagnetic field at the point P located directly above the center of the magnet?

  11.34: A wire lies in the plane of thepxi-t3r b a.qbcv) s(l.0n4de page with conventional current I shown. At the instant shown, what is the direction of the magnetic fp c 3xbs.in.4vq(d a)lt0be-rorce 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 t6; abbivv*petd c*6vp(e.,fj ,(tl/hxnl+ikhe proton moving toward the top of the page at the instant shown, what is the direction of the magnetic force on the a6nci pvdb6hx(*j vv pl (t+kb*,;e.il, t/feproton?

  94.30: The conventional cx 0uc7x zhit:y0l- e0durrent I in a long straight wire flows in the upward direy0h i0l7xe0z -cu:dxtction 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 toward it, the force on the proton is:

  95.16: A charged particle with constant speed enters a uniform magnetic xm blco3p 38.zfield whose direction is perpendicular to the particle’s velocity. The partil3c m38xz.b pocle will:

  98.10: A charged particle withm6b oj: py0 e- hja22lmr*fzxk-x*ap) constant velocity enters a uniform magnetic field whose direc - 6mapxjxb 0je mkop-zhaf2: *)y2l*rtion is parallel to the particle’s velocity. The particle will

  03.34: A positively charged particle of mass M is at rest on a table.:7lv39dbc ixx rw2/sb2ko.sl A non- zero electric field E is directed into the plane of the table. A non-zero magnetic field/c s.:sidl2brwbx 29kv3o l x7 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 ve:ci r: 3cse3eolocity 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 electric field in tho: csc3e:ei3ris region of space? Ignore gravity

  04.14: A positive electric c vg i ej2*3;sf*vfrp*;gnb.bdharge of negligible weight is released from rest between the poles of a horseshoe magnet as shown. What would be the direction of the acceleration of the charge caused by 3 npgfbsedf;*igvvj *r; 2b.* the magnetic field?

  10.26: An electron moving in the plane of the pagcrmb+kdh4:q (xto yt 2,x rs74e at an angle of 300 to the horizontal enters a region with a constant magnetic field directed horizontallrxk+o,q:4b(thm 4s r7x tydc2y 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 ma fdb t(q.::dihb qn:,oves 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 mass m travels at a si)wjyl:-ny5 apeed v in a plane perpendicular to a magnetic field of ma 5j):y in-yawlgnitude B. The electron follows 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 fii 04e ry0yh/- xvh0mxmeld B and is deflected into a path with a radius ofe4y0h i 0x/myvrm -0hx curvature R. If a second ion 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 uniform magnetic field B. A:2uc4u*nwux.f qrjj:d 7r4 vy helium nucl:unru x42j 4 r*uq:jy dw.fvc7eus moves in a circular orbit in the 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 perpendiculi) yr/j46ns.8vrhq rzar 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 z4 sjny 6i8rvh.qr r)/ be the same for the two ions?

  02.15: A positively charged particle moves toi5g(wuo(myqhs 2z wkk59 s0 nth-/df+t+rn4t the right. It enters a region of space in which there is an electric field directed up the plane of the pap 4z(-igks wt0ht9rdwk+ mhsfn+5uo yq5t(n / 2er (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 and5c19/ )dy7x1ajuiara2r sas w 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 electrically chargedv wsxnsb;8; 0h beta particles is commonly determined byb08s w ;vxn;sh

  09.27: A proton moves straight up the plane of this page into a regionc, s07t;mt(1okfzz an5(gq o n that has a magnetic field directed to the right. If the pao s; ,mg7a zz(cn f0n5qotk1t(rticle 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+h u5d4o;ib one1 nl+r two regions of space along the dotted-line ;ru o+ib+hnd 51 e4nlotrajectory 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 field in regions I and II?
Ignore gravitational forces.

  12.36: A positive charge moves with ch1,oa i-sjsa11u0 b1yqnles ,onstant velocity through a region of space containna,1b 1sy,0h j1 qsue-sila1oing 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 vet/qf 99)l1giqv rn;kcz : az9tlocity directly between two long straight wires. The conventional current in each wire has the same magnitude, but the currents are in opposite dire;9q gicnaz:)t/qz9v1krt l f9ctions 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.