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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

`(5)/(3)mu_(0)`

D

`(5)/(2)mu_(0)`

Text Solution

Verified by Experts

The correct Answer is:
4
`B=(n mu_(0)i)/(2r)`
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