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# A vertical ring of radius r and resistance R 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 top horizontal of the rail section is

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a
0
b
2BrvR
c
4BrvR
d
8BrvR

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detailed solution

Correct option is D

I=2BrvR/2=4BrvRCurrent in the top horizontal =2i=8BrvR

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