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A thin circular disk of radius R is unif...

A thin circular disk of radius `R` is uniformly charged with density `sigma gt 0` per unit area.The disk rotates about its axis with a uniform angular speed `omega`.The magnetic moment of the disk is :

A

`pi R^(2) a omega`

B

`(piR^(4))/(4) alpha omega`

C

`(piR^(4))/(4) alpha omega`

D

`2pi R^(4) alpha omega`

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