94.20: A magnet is dropped through a vertical g33a 7jo*qzi v)v-)ep5d txclcopper pipe slightly larger than the magnet.3ld * q3vi)-cga)p5o xetvzj 7 Relative to the speed it would fall in air, the magnet in the pipe falls:

  01.30: Lenz's law concerning the direction of an induces6 y52twsof9q u5pwza3. c7q/e7gx gtd current in a conductor by a magnetic field could be a restat3a c7ygot9q5gs uz6q72 wfws5p ./ txeement of

  11.25: The product (3 Teslas) × (2 meters) × (4 meters/second) is equiu8m)zaag q dfb0s(p 5:valent to which one of the following: q(fs)u8 0maa zpdb5g?

  04.34: A square loop is placed in a un ;qhv: uwnx; cazrk,;;a5guz7 iform magnetic field perpendicular to the plane of the loop as shown. The loop is 0.5 meters on a side an7 qhawuv z:;a zu;xc g5,knr;;d 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 magnetic field directed into the pnz75-v na h.jfage. The wire experiences an induced charge separation as shown. Which way is thnvz-jhf5 .a7n e wire moving?

  00.20: A wire moves with a velocity v thro: 66a 7fohg5yu2vdhno ugh a magnetic field and experiences an induced charge separation as shown. What is the direction of the magnetic field? :267uod5h 6oh ag ynfv

  05.33: The figure below shows a bar moving to th w;z .zl5k uj/f.hgocc)nn.;be right on two conducting rails. To make an induced current i in thcj;c kfwz hn)g..b nul./5o; ze direction indicated, in what direction would the magnetic field be in the area contained within the conducting rails?

  00.10: When a wire movfi+ yr-0hze10si g jfs5jh ;.31cdm giing through a magnetic field has a voltage induced between the wire’s ends, tha .sdcjhhfys-10m+ir j3 e1 igz0f i;g5t voltage 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 copper rod has constant velocit 8x6as m/byv*gy 0.30 m/s traveling through a uniform magnetic field of 0.060 T. The rod, velocity, and mag yas*vm68/bx gnetic 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 ttl 4z3 df( ugms-0xc,io the 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 each circuit. Rank the ci( l,it 0 fx-sugz3cdm4rcuits for the brightness of the bulb labeled R1 from brightest to dimmest.

  07.34 For the solenoids shown in the diagram (which arox ; h:b/sp.fz - mzg:bot+i.pe assumed to be close to each other), the resistance of the left-tgoxp p/soi -zb+:b;h.:z. fmhand circuit is slowly increased. In which direction does the galvanometer needle in the right-hand circuit move in response to this change?

  08.29: A strong bar magnet is held very close to the opening of a solenoid9pve1eeafq 0. 5po: p0.7 z d+mhjs.xj jq+bzg as shown in the diagram. As the magnet is moved away from the solenoid at constant speed, what is the direction of conventional current throub+d eoqe+g5 e.qz0:jhjsz 9f7 1ppa p.v.jxm0 gh 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 thexqv1pz)uv rr lo-f 3 yt w7w5hy-pq78(tzh4/y circuit on the left 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 and in what direction is the cvz5(qp7oy1v-wz ryt h-r7/p4u8yfh qwtl3 )xonventional current through the resistor in the right-hand circuit?

  10.39: A strong bar magnet is held very close to the opening of a solenoid xc)ooh3 ho67 ,diny0a as shown in the diagram. As the magnet is moved to the left toward the solenoid, a conventional current 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 “??” ii6dxhon)c3o 70,ha y on the diagram represent?

  14.34: Two circular loops of re.-u-dbef (2ubskgqkvs d /0j/ sistive wire are placed next to each other as in the figure. The circular loop on the left is connected to a constant voltage 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 figgdbbj-(s 2kuv//-seu f0 . qkdure from above)?

  11.41: For the figurr,u,loumo k6d/h3re * e shown, the variable resistance of 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 variable resistance o9jijg7yfe 4x-gfxw j+ )9i03c oenv8bf 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 wire loop sits i/0 m5z0pmvk0.x- idzv. x+vwtdtze(;eoap 6nn a plane perpendicular to a spatially uniform magnetic field pointing into the plane of the page as shown. The magnetic field strength steadily increases with time. Which one of the following effects best describes the result of this field-0 tozz wve;xdpei.mzxd. 0kt5vnm/0pv (6+a increase?

  16.47: Two small loops of wire are located close to a wire with:+d27tooph/aw8 b m3 j0a ucym conventional current directed up the page. A scientist then moves the loops away from the current as shown. What is the orientation of the conventional curre8w:b a73+p0tuomhjy/ 2 cm adont in each loop while this occurs?

  17.35: A metal bar is moving to thelc+y( l8:gxttnx1 ho(x(5lk o left across a set of frictionless conducting rails as seen in the figure. Throughout the region between the rails, there is a uniform lxxk((oc tlxy: 8(ot lg5+1hnmagnetic 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 infinitel m/a; cu-hxk, zeq8t(gy long solenoid passes through the circuit as shown. The magnetic field of the solm(kt;/x,ea8- qg hcuz enoid, 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 directed into the plane of the page is decre4j4c:twy p r3j :oui o4,ynryp z4a;m:asing 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. What is the magnitude of the v34:z,w:4: atmnpi 4pr;ro jjoyycy u4oltmeter’s reading?