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Two coplanar concentric circular coils o...

Two coplanar concentric circular coils of radii r and 2r, have the same number of turns n. The smaller coil carries a clockwise current i, while the larger coil carries an anticlockwise current 2i. The magnetic field induction at the centre is

A

`(3mu_(0)n i)/(4r)`

B

zero

C

`(mu_(0)n i)/(4r)`

D

`(mu_(0)n i)/(2r)`

Text Solution

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The correct Answer is:
B
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