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[" 20.A metal rod of resistance "R" is f...

[" 20.A metal rod of resistance "R" is fixed along; "],[" diameter of a conducting ring of radius "r" .There "],[" a magnetic field of magnitude "B" perpendicular "],[" the plane of the loop.The ring spins with angular "],[" speed "omega" about its axis.The centre of the ring "],[" joined to its rim by an external wire "W" .The wis "],[" Whave no resistance.The current in "W" is "]

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