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A long wire carries a steadycurrent. It ...

A long wire carries a steadycurrent. It is bent into a coil of one turn such that magnetic induction at centre is B, then same wire is bent to form a coil of smaller radius of `n` turns when magnetic induction at centre is B' then

A

`B' = B`

B

`B' = nB`

C

`B' = n^2B`

D

`B = n^2B'`.

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