A vertical ring of radius r and resistance R slips vertically between two frictionless and resistanceless vertical rails The

Question

A vertical ring of radius r and resistance R slips vertically between two frictionless and resistanceless vertical rails The rails which are joined at top There is a uniform magnetic field of magnitude B perpendicular to plane of the ring and the rails When speed of ring is v the current in the section PQ is A zero C 4Brv R B 2Brv R D 8Brv R P

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