Question

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 ring moves 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

( a ) zero ( b ) 2 Brv R ( c ) 4 Brv R ( d ) 8 Brv R

Answer 1

Answer:

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