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Physics Question on Electromagnetic induction

A copper disc of diameter 20 cm20\, cm makes 1200 r.p.m1200\, r.p.m. about its natural axis kept parallel to a uniform magnetic field of 10−210^{-2} T. The potential difference between the centre and edge of the disc is

A

6.28×10−3 V6.28 \times 10^{-3}\,V

B

62.8×10−3 V62.8 \times 10^{-3}\,V

C

0.628×10−3 V0.628 \times 10^{-3}\,V

D

0.628 V

Answer

62.8×10−3 V62.8 \times 10^{-3}\,V

Explanation

Solution

e = \frac{1}{2} BR^\, omega where ω=2π f\omega = 2 \pi \, f