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A ring of radius R, made of an insulatin...

A ring of radius `R`, made of an insulating material carries a charge `Q` uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed `omega`, then the magnitude moment of the ring is

A

`Q omega R^(2)`

B

`1//2 Q omega R^(2)`

C

`Q omega^(2) R`

D

`1//2 Q omega^(2) R`

Text Solution

Verified by Experts

The correct Answer is:
B
`M = IA `
`I = (Q omega)/(2pi) , A = pi R^(2)`
`m = (Q omega)/(2pi) xx pi R^ (2) = (1)/(2) Q omega R^(2)`
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