A non-magnetic metal ring is suspended from a thread. It is spinning. You bring a strong...
A non-magnetic metal ring is suspended from a thread. It is spinning. You bring a strong magnet near the ring but not touching it and the ring stops rotating. What is happening?
A. The ring is being repelled by the magnet.
B. The ring is being attracted to the magnet.
C. The part of the ring approaching the magnet is repelled from the magnet and the part of the ring moving away from the magnet is attracted to the magnet.
D. The part of the ring approaching the magnet is attracted to the magnet and the part of the ring moving away from the ring is repelled by the magnet.
Homework Answers
C. The part of the ring approaching the magnet is repelled from the magnet and the part of the ring moving away from the magnet is attracted to the magnet.
It can be explained using Lenz's law. when we bring the magnet close to rotating ring the magnetic flux through the ring changes. so emf is induced and and induced current flows through the ring. This induced current opposes the motion of the ring. so, finally the ring comes to rest.
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