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A metallic rod of length 'I' is rotated...

A metallic rod of length 'I' is rotated with a frequency v with one end hinged at the centre and the other end at the circumference of a circualr metallic ring of a radius r, about an axis passing through the centre and perpendicular to the plane of the ring. A constant uniform magnetic field B parallel to the axis is present every where. Using Lorentz force, explain how emf is induced between the centre and the metallic ring and hence obtain the expression for it.

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