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A gold ring is dropping toward vertical a bar magnet whose south end is its upper end. The ring is oriented horizontally, and as it continues to drop,

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Presentation on theme: "A gold ring is dropping toward vertical a bar magnet whose south end is its upper end. The ring is oriented horizontally, and as it continues to drop,"— Presentation transcript:

1 A gold ring is dropping toward vertical a bar magnet whose south end is its upper end. The ring is oriented horizontally, and as it continues to drop, it will encircle the bar magnet. But it is not encircling the bar magnet yet, it is dropping toward it. What is the direction of the current, if any, induced in the gold ring. a) Clockwise as viewed from above. b) Clockwise as viewed from below. c) No current is induced in the ring.

2 A bar magnet is hanging, south end down, at rest by a string tied to the ceiling. The lower end of the magnet is two centimeters above the floor. The magnet is centered over a copper loop which is lying flat on the floor. A person pulls the magnet eastward and lets go. The magnet swings down toward the loop. As it approaches the center of the ring, current is induced to flow in the loop in what direction? a) Clockwise as viewed from above. b) Clockwise as viewed from below. c) No current is induced to flow in the loop.

3 A silver hoop tightly encircles a vertical stick with a lot of wire with non-zero resistivity wrapped one way around it. The ends of the wire are connected across a huge, charged, capacitor. The capacitor is discharging through the wire making up the coil in such a manner that the current in the coil is clockwise as viewed from above. Find the current, if any, induced to flow in the hoop. a) Clockwise as viewed from above. b) Clockwise as viewed from below. c) There is no induced current.

4 Consider a wall clock whose second hand is a bar magnet whose north pole is the second indicator. Assume the clock to have a copper ring positioned above it like a halo. What is the direction of the current induced to flow in the copper ring when the second hand is between the 12 and the 3? a) Clockwise as viewed from above. b) Clockwise as viewed from below. c) No current is induced in the ring.

5 Consider a wall clock whose second hand is a bar magnet whose north pole is the second indicator. Assume the clock to have a copper ring positioned above it like a halo. What is the direction of the current induced to flow in the copper ring when the second hand is between the 3 and the 6? a) Clockwise as viewed from above. b) Clockwise as viewed from below. c) No current is induced in the ring.

6 Consider a wall clock whose second hand is a bar magnet whose north pole is the second indicator. Assume the clock to have a copper ring positioned above it like a halo. What is the direction of the current induced to flow in the copper ring when the second hand is between the 6 and the 9? a) Clockwise as viewed from above. b) Clockwise as viewed from below. c) No current is induced in the ring.


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