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A square loop PQRS of side 'a' and resis...

A square loop `PQRS` of side `'a'` and resistance `'r'` is placed near an infinitely long wire carrying a constant current `I`. The sides `PQ` and `RS` are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by `180^(@)` about an axis parallel to the long wire and passing through the mid points of the side `QR` and `PS`. The total amont of charge which passes through any point of the loop during rotation is:

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