Question

A bar magnet with its north pole pointing upward is falling toward the center of a...

A bar magnet with its north pole pointing upward is falling toward the center of a horizontal conducting ring. As view from above, what is the direction of the induced current in the ring?

Counterclockwise

No current is induced

Clockwise

Vertical

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Answer #1

According to lenz law,in a region of changing magnetic flux, current is induced such that it tries to oppose the change in flux.

Now, north pole of the magnet is pointing up. So, magnetic flux through the ring is towards the observer when looked from above. Also, since magnet is moving towards the ring, magnetic flux is increasing with time.

So,when viewed from above, magnetic flux is towards the observer and is increasing. So, according to lenz law, induced current will cause a magnetic flux away from the observer. This requires a clockwise current according to right hand rule.

So, induced current is clockwise.

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