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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 uniform surface density. Half the disc is in a region of a uniform, unidirectional magnetic field \( \mathrm{B} \) parallel to the plane of the disc, as shown. Then,
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