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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
IntermediateMCQConceptual12.9k
A vertical cylindrical solenoid wrapped with wire coils sits on a flat surface. A circuit connected to the solenoid includes an open switch and a DC battery. Resting on the top opening of the solenoid is a flat horizontal metal ring. An arrow wrapped around the solenoid coils indicates a counterclockwise current direction when viewed from above. No other labels, lines, text, or axes appear.
A conducting ring resting on top of a vertical solenoid.
A light, conducting aluminum ring rests horizontally on top of a vertical solenoid. The solenoid is connected in series with a switch and a DC power source. Viewed from above, the current in the solenoid flows counterclockwise when the switch is closed. Immediately after the switch is closed, the current in the solenoid increases rapidly from zero. Which of the following correctly identifies both the direction of the induced current in the ring (as viewed from above) and the direction of the magnetic force exerted on the ring?

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