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A thin non conducting disc of radius R i...

A thin non conducting disc of radius `R` is rotating clockwise (see figure) with an angular velocity `omega` about its central axis which is perpendicular to its plane Both its surfaces carry+ve charges of unifrom surface density Half the disc is in a region of a unifrom unidirectional magnetic field `B` parallel to the plane of the disc as shown Then
.

A

The net torque on the disc is zero

B

The net torque vector on the disc is directed leftwards .

C

The net torque vector on the disc is directed rightwards .

D

The net torque vector on the disc is parallel to `B` .

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The correct Answer is:
B
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