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A long wire carrying a steady current is...

A long wire carrying a steady current is bent into a single coil such that magnetic induction at centre is B. Then same wire is bent to form a coil of smaller radius of 4 turns when magnetic induction at centre is B'. Then

A

B' = B

B

B' = 2B

C

B' = 16 B

D

B = 4B'

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The correct Answer is:
C
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