$A$ metal disc of radius $R$ rotates with an angular velocity $\omega$ about an axis perpendicular to its plane passing through its centre in a magnetic field of induction $B$ acting perpendicular to the plane of the disc. The induced e.m.f. between the rim and axis of the disc is (magnitude only):
- A$\frac{R \omega^2 R^2}{2}$
- B$\frac{R \omega R}{2}$
- C$\frac{B \omega^2 R}{2}$
- D$\frac{B \omega R^2}{2}$
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