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[" A small circular coil of radius " "r"...

[" A small circular coil of radius " "r" and having "n' turns carries a current "7" .The coefficient of self-induction of the coil is "],[[" (A) "mu_(0)pi nr/2],[" (B) ",mu_(0)pi nr],[" (C) ",mu_(o)pi n^(2)r/2],[" (D) ",mu_(o)pi nr^(2)/2]]

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