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Two concentric circular coils of ten tur...

Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` and they carry respectively `0.2` and `0.3` ampere current in opposite direction. The magnetic field in `Wb//m^(3)` at the centre is

A

`(35//4)mu_(0)`

B

`(mu_(0)//80)`

C

`(7//80)mu_(0)`

D

`(25//2)mu_(0)`

Text Solution

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The correct Answer is:
B
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