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A flat dielectric disc disc of radius R ...

A flat dielectric disc disc of radius R carries an excess charge on its surface. The surface charge density is `sigma`. The disc rotates about an axis perpendicular to its plane passing through the center with angular velocity `omega`.
Find the magnitude of the torque on the disc if it is placed in a uniform magnetic field whose strength is B which is directed perpendicular to the axis of rotation

A

`1/4 sigma omega pi BR`

B

`1/4 sigma omega pi BR^2`

C

`1/4 sigma omega pi BR^3`

D

`1/4 sigma omega pi BR^4`

Text Solution

Verified by Experts

The correct Answer is:
D
`1/4 sigma omega pi BR^4`
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