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A metalic ring is dropped down, keeping ...

A metalic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the region of mangetic fied at `t=0` and completely emerges out `t= Ts`. The current in the ring varies as:

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
b
During free fall of ring through a magnetic field, when ring enters the constant and horizontal magnetic field, the induced current flows in the ring in such a direction that opposes the cause producing it. Now when ring leaves the magnetic field, again current is induced in the ring but in opposite direction. Also during the stay of ring completely in the field there is no direction. Hence, correct graph wil be (b)
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