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A supercondutig round ring of radius ...

A supercondutig round ring of radius `a` and inductance `L` was located in a unifrom magnetic fied of induction `B`. The ring plane was parallel to the vector `B`, and the current in the ring was equal to zero. Them the ring was turned through `90^(@)` so that its plane became perpendicular to the feild. FInd:
(a) the current induced in the ring after the turn,
(b) the work perfromed during the turn.

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