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Two concentric coils of 10 turns each ar...

Two concentric coils of 10 turns each are placed in the same plane. Their radii are `20cm` and `40 cm` and carry 0.2 and `0.2` amp. Current respectively in opposite directions. The magnetic induction `( ` in Tesla `)` at the centre is

A

`3/4 mu_0`

B

`5/4 mu_0`

C

`7/4 mu_0`

D

`9/4 mu_0`

Text Solution

Verified by Experts

The correct Answer is:
B
`B = (nmu_0 i)/(2r)`
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