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`

A thin circular disk of radius `R` is uniformly charged with density `

1.	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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