19 A metallic wire is folded to form a square loop of side a It...
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19 A metallic wire is folded to form a square loop of side a It carries a current i and is kept perpendicular to a uniform magnetic field If the shape of the loop is changed from square to a circle without changing the length of the wire and current the amount of work done in doing so is a i Ba 2 c i Ba 4 1 6 b i Ba 2 951 Ba 1 4 i
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