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
.

Options

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

Answer

B