EMF between the rim and the axis of a metal disc rotating in a perpendicular field

1. A.
   $B\pi R^2$
2. B.
   $2B\pi^2 R^2 \omega$
3. C.
   $B\pi R^2 \omega$
4. D.
   $\frac{BR^2\omega}{2}$

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1. A.
   $\pi BR^2$
2. B.
   $2\pi^2 BR^2\omega$
3. C.
   $\pi BR^2\omega$
4. D.
   $\frac{BR^2\omega}{2}$

Tap an option to check your answer.