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Surface charge density on a rign of radi...

Surface charge density on a rign of radius a and width d of is `sigma` as sbown in the figure. It rotates with frequency f about its own axis. Assume theat the charge is only on outer surface. The magnetic field inductioni at centre is (Assume that `d lt lt a`)

A

`pi mu_(0)f sigma d`

B

`mu_(0)f sigma d`

C

`2 pi mu_(0)f sigma d`

D

`(pi^(2))/(2mu_(0))f sigma d `

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The correct Answer is:
A
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