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A coil is wound on a frame of rectangula...

A coil is wound on a frame of rectangular cross - section. If all the linear dimensions of the frame are increased by a factor `2` and the number of turns per unit length of the coil remains the same, self - inductance of the coil increases by a factor of

A

`30^@, 1 A`

B

`45^@, 0.5 A`

C

`60^@, 1.5 A`

D

none of these

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