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A metallie rod of 1 m length is rotated ...

A metallie rod of 1 m length is rotated with a frequency of 50 revis, with one end hinged at the centre and the other end at the eireumference of a circular metallic ring of radius 1m, about an axis passing through the centre and perpendicular to the plane of the ring as in figure. A constant and uniform magnetic field of the parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?

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