A magnet is hung by a string and then placed near a wire as shown. When the swit

Question

A magnet is hung by a string and then placed near a wire as shown. When the switch is closed, the magnet rotates such that the ends of the magnet move as indicated by the arrows.

At the instant the switch is closed determine...

1. The direction of the current through the wire segment nearest the magnet. Explain.

2. The direction of the net force exterted by the magnet on the wire segment at the instant that the magnet is in the position shown. Explain.

***Note, saying "because of the RHR" is NOT an explanation.

Explanation / Answer

1. SINCE induces emf always opposes the one waht caused it, if magnet is rotates as shown in fig, the only possibility that current must flow in the upward direction. this ios due to the oppsing motion.

2.

it means same type of polarities wud be devolped on the oppsite ends of loop and mangets, and due to repusion it rotates in the given direction.

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