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A charge \( Q \) is uniformly distributed over the surface of non-conducting disc of radius \( \mathrm{R} \). The disc rotates about an axis perpendicular to its plane and passing through its centre with an angular velocity \( \omega \). As a result of this rotation a magnetic field of induction \( \mathrm{B} \) is obtained at the centre of the disc. If we keep both
\( \mathrm{P} \) the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the

W disc then the variation of the magnetic induction at the centre of the disc will be represented by the figure.
(A)
(D)
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