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The figure shows the cross-section of a ...

The figure shows the cross-section of a long cylindrical conductor of radius a carrying a uniformly distributed current i. The magnetic field due to current at P is :

A

`mu_(ir//(2pia^(2))`

B

`mu_(0)ir^(2)//(2pia)`

C

`mu_(0)ia//(2pir^(2))`

D

`mu_(0)ia^(2)//(pir^(2))`

Text Solution

Verified by Experts

The correct Answer is:
A
`B=(mu_(0)Ir)/(2piR^(2))` for `0ltrlt R` for cylindrical conductor
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