A vertical ring of radius 
and resistance 
falls vertically. It is in contact with two vertical rails which are joined at the top. The rails are without friction and resistance. There is a horizontal uniform magnetic field of magnitude B perpendicular to the plane of the ring and the rails. When the speed of the ring is v, the current in the section PQ is-
Text Solution
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In the question, current flow in the ring will be through the two semicircular portions, in parallel.
Induced emf, 
.
Resistance of each half of ring 
.
As these are in parallel, the equivalent resistance 
.
Current in the circuit 
.
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