F-0bIt is the Friday before Spring Break. Yet I am here, dutifully attending lecture. Shouldn’t I receive some clicker points?A) Yes, give me the points please.B) No, I am not here, so no points for me, thank-you.F-1 A bar magnet is inside an (imaginary) closedsurface S. What can you say about the magneticflux through the surface? SB dA��rr� is..A) zero B) positive C) negativeD) impossible to tell from the information givenNSdAF-2A loop of wire is moving rapidly through a uniform magnetic field as shown.True or False: there is a non-zero emf induced in the loop.A loop of wire is spinning rapidly about a stationary axis in uniform magnetic field as shown. True or False: there is a non-zero emf induced in the loop.A) TT B)FF C)TF D)FTF-3A loop of wire is sitting in a uniform, constant magnet field as shown. Suddenly, the loop is bent into a smaller area loop. During the bending of the loop, the induced current in the loop is ...A: zero B: clockwise C: counterclockwiseB(in) B(in)F-4A bar magnet is positioned below a horizontal loop of wire with its North pole pointing toward the loop. Then the magnet is pulled down, away from the loop. As viewed from above, is the induced current in the loop clockwise or counterclockwise?A: clockwiseB: counter-clockwiseNSeyeballF-5A square loop is rotating in a fixed, external magnetic field into the page. Atthe instant shown, the loop is out of the plane of the page with left side of the loop above the page and coming out of the page, the right side in going in. The induced current is ...axis of rotationB(in)ABC) NeitherF-6A loop of wire is near a long straight wire which is carrying a large current I,which is decreasing. The loop and the straight wire are in the same plane and are positioned as shown. The current induced in the loop is A: counter-clockwise B: clockwise C: zero.I to the right, but decreasing . loopF-7Two loop of wires labeled A and B are placed near each other as shown. A large current I in loop A is suddenly turned on. This causes an induced current in loop B which causesA: A net replusive force - the two loops repelB: A net attractive force - the two loops attractC: whether the force is attractive or repulsive depends on whether the current in first loop is CW or CCWD: No net force.F-8 A wire loop, moving right, enters a region where there is a constant, uniform magnetic field pointing into the page.As the loop enters the B-field, the current induced in the loop is ...A: CW B: CCWAs the loop enters the B-field, the direction of the net force on the loop is ...A: right B: C: up D: downE: there is no net forceBF-9An electric motor consists of a coil, free to turn on an axis, and located in an magnetic field B created by an arrangement of permanent magnets. With thecurrent and field directions as shown, which way will the coil rotate?A: CW B: CCWC: the coil won't rotate when at this particular orientationaxisB BIBAF-10 A solenoid has an increasing current causing an i ncreasing B-field in its interior. An end-on view of the solenoid is shown below. An electron is directly below the solenoid. While the current I in the solenoid is increasing,what is the direction of the force on the electron?Hint: What is the direction of the E-field at the position of the electron? Think Lenz's Law.F-11 A long solenoid of radius R contains a uniform magnetic field B whichis increasing at a steady rate [B(t) = A t, where A is a constant]. For distances r < R from the center of the solenoid, how does the magnitude of the Electric field depend on r? Hint: E dlddtB da z ze jA: E = zeroB: E 1/rC: E rD: E r2E: E r3B(in)ABDCelectronR r
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