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A vertical ring of radius r and resistance R falls vertically It is in contact...

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Physics

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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 section PQ is A zero C 4Brv R B D 2Brv R 8Brv X X X

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