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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 ` B R

B

`(1)/(4) sigma omega pi B R^(2)`

C

`(1)/(4) sigma omega pi B R^(3)`

D

`(1)/(4) sigma omega pi B R^(4)`

Text Solution

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The correct Answer is:
A, B, D
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