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A metallic ring is dropped down, keeping...

A metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of magnetic field at t = 0 and completely emerges out at t = T sec. The current in the ring vauies as

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B

1. When the ring is just entering the magnetic field emf is induced and the current flows in one difection. 2. When the whole rings is surroundings the flux inside, there is no chaange in the flux.
Indiced emf = 0 current is zero.
3. When the ring just goes out of hte region of fludx, a pulse of current produced which is opposite to that of 1 given above.
b is the only figure that deescribes this.
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