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A supereconducting round ring of radius ...

A supereconducting round ring of radius a and inductance `L` was located in a uniform in a uniform magnetic field of induction `B` . The ring plane was parallel to the vector `B` and the current in the ring was equal to zero, then the ring was turned through `90^(@)` so that its plane became perpendicular to the field. Find
(a) the current induced in the ring after the turn
(b) the work performed during the turn.

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