94.20: A magnet is dropped through a ver1asdl7eqc8/rg r 8m6rm fl4 c:tical copper pipe slightly larger than the magnet. Relative to the sped a c4r8 f6r8lml1se:qcr/m7ged it would fall in air, the magnet in the pipe falls:

  01.30: Lenz's law concerning the direction of an indu .b9egcriax / nva1(1a s8ws v*3xk)meced current in a conductor by a maven 9ar sc3s (a )wgvab1e*1x/k.i8xm gnetic field could be a restatement of

  11.25: The product (3 Teslaq r y 8( y,cb wetz1+*.0z.rykp(jsgtcs) × (2 meters) × (4 meters/second) is equivalent to which one of thg.1*tw(zyp tje8 .rrk +yy( qczc0b,s e following?

  04.34: A square loop is placed in a uniform magnetic field perpendicular l2gtm 0p5i-/.* v7tmu2oosri)x)uf*mlsfg m to the plane omu0xvm stl5**2 f)pglt-i.sium r/mo 7 ofg)2f the loop as shown. The loop is 0.5 meters on a side and the magnetic field B has a strength of 2 T. If the loop is rotated through an angle of $90^{\circ}$ in 0.1 second what would be the average (RMS) induced EMF in the loop?

  97.32: A wire moves through a magnetigfx 8kgsptsix x7k:jb, n7un4g; . 7*ic field directed into the page. The wire experiences an induced charge separation as shown. Which 7xg bgu k .s 8xink s7*x7ntp4,ifj;g:way is the wire moving?

  00.20: A wire moves with a velocity v through a magnetic field and expe ng-vt4/hl/f zriences an induced charge separation as shown. What is the direction of the magne h-/4vg/lfnz ttic field?

  05.33: The figure below shows a bar moving to the right on two conducwry 1,uz,k ht8ting rails. To make an induced current i in the direction indicated, in what direction would the magnetic field be in the area contained withu,t hz 1wyr8k,in the conducting rails?

  00.10: When a wire moving through a 0a: term xv419t(bnus;f 8w0e/h bmgpmagnetic field has a voltage induced between the wire’s ends, that x ws(8;f r:h/ 4mbpt1etnumaeb v 009gvoltage is
I. directly proportional to the strength of the magnetic field
II. directly proportional to the velocity of the wire
III. directly proportional to the diameter of the wire

  95.30: A 0.20 m long coppe09fm wqjl 0utnoxzp.p0 7z1 )hr rod has constant velocity 0.30 m/s traveling through a uniform magnetic field of 0.060 T. The rod, velocity, and m.p709nx ojfz pluwqz h 1)0mt0agnetic field are all mutually perpendicular. What is the potential difference induced across the rod’s length?

  04.42: A solenoid is oriented end-on so that its opening is perpendicular to 4s f+wmkm smwu,7wwjies.yw2(; +4arthe circuit containing the two light bulbs as drawn in figure C1. For figures C2 and C3, a shorting wire of negligible resistance is added as shown. Assume that the magnetic field from the solenoid, shown coming out of the plane of the page, decreases uniformly in time at the same rate for mw;k7wa r2wmwj w.4+y 4i(+mf,uesss each circuit. Rank the circuits for the brightness of the bulb labeled R1 from brightest to dimmest.

  07.34 For the solenoids shown in the diagram (wrlr y 7rn. a4tg-dt1+p-s8amphich are assumed to be close to each other), the resistance of the left-hand circuit is slowly increased. In which direction does the galvanometer needle in the right-hand circuit m d+7 p8rtaapml-g t4y.r1 -srnove in response to this change?

  08.29: A strong bar magnem0e,rrbno(vyzf 1e/ 0t is held very close to the opening of a solenoid as shown in the diagram. As the magnet is moved away from the solenoid ate br, nyvf/r1o0 z0me( constant speed, what is the direction of conventional current through the resistor shown and what is the direction of the force on the magnet because of the induced current?

  09.37: For the figure shown, the variable resistance in the circuit on the lebrj( 1jl++w2pu9 zmoxft is increased at a constant rate. What is the direction of the magnetic field at the point P at the center of the left-hand circuit (jmu9+o2j+wrbzpxl1 and in what direction is the conventional current through the resistor in the right-hand circuit?

  10.39: A strong bar magnet is heldyf 7+lilta4sj6 9mmh0 very close to the opening of a solenoid as shown in the diagram. As the magnet is moved to the left toward the solenoid, a conventional curaj 9hl6syif l7t mm+40rent through the resistor shown is directed from A to B. What is the direction of the force on the bar magnet because of the induced current in the solenoid and which magnetic pole does the “??” in the diagram represent?

  14.34: Two circular loops of resistive wire are placed nm m: byecj22vnow t:(* d3+xqrext to each other as in the figure. The circular loop on the left is connected to a constant nmvo*:b 32 y dxcwmq j(r+et:2voltage source V. The resistance of this loop is increasing linearly with time. As the resistance is changing, what is the direction of the magnetic field at point P (the center of the left-hand loop) and what is the orientation of the conventional current in the right-hand loop (as viewed in the figure from above)?

  11.41: For the figure shown, the variable resistance o:pq..v iswfxl37; d7; domcief the outer circuit $R_{inner}$ is decreasing at a constant rate. While this is occurring, in which direction is the magnetic field associated with the outer circuit at the point P in the plane of the circuit and in which direction is the conventional current through the resistor $R_{outer}$ in the smaller interior circuit? The two circuits lie on a flat table.

  13.35: For the figure shown, the var rw)e5k.cg jnx,(hie0iable resistance of the innercircuit $R_{inner}$ is increasing at a constant rate. While this isoccurring, in which direction is the magnetic field associated with the inner circuit at the point P in the plane of the circuitand in which direction is the flow of electrons through the resistor labeled $R_{outer}$?

  12.38: A square, conducting tq l+0vv ow93gwire loop sits in a plane perpendicular to a spatially uniform magnetic field pointing into the plane of the page as shown. The magnetic field stre lwvvt3 0+oqg9ngth steadily increases with time. Which one of the following effects best describes the result of this field increase?

  16.47: Two small loops of wire are locate.navgsjl5;au 0 01osad close to a wire with conventional current directed up the page. A scientist t0vla0as5su 1n ;.gjoahen moves the loops away from the current as shown. What is the orientation of the conventional current in each loop while this occurs?

  17.35: A metal bar is moving to the left ac)8e :vmc fy6w: n4asxjross a set of frictionless conducting r v:a wjmcns )xf:86y4eails as seen in the figure. Throughout the region between the rails, there is a uniform magnetic field directed into the plane of the page. The resistors labeled X and Y are identical. Which one of the following choices correctly indicates the direction of the conventional current in the resistors and the relation between the magnitude of the currents through each resistor at the instant shown?

  08.50:. An infinitely long solenoid passes te6ari.juz0 ni48 5aofxzes** hrough the circuit as shown. The magnetici8 j5e0o.ie az*z*nafsurx6 4 field of the solenoid, directed into the
plane of the page, is weakening which produces a constant emf of magnitude ξ for a closed loop around the outside of the solenoid. Once equilibrium is established in this circuit, what is the voltage across the switch S?

  15.50 A magnetic field directedy+(ih m(z3r m;mo/ o3e pw8+vedr6wtg into the plane of the page is decreasing in time. A constant emf ξ is produced for the square loop enclosing the field in the figure. The square loop has three identical light bulbs of resistance R in it and an ideal voltmeter connected to the corners through the center of the loop/i(rogv hpy+owemrm3e3+wd 6 zt(;m 8. What is the magnitude of the voltmeter’s reading?