A conducting disc of radius r spins about its axis with an angular velocity ω. There is a uniform magnetic field of magnitude B perpendicular to the plane of the disc. C is the centre of the ring.(a) No emf is induced in the disc. (b) The potential difference between C and the rim is 1/2 Br2ω. (c) C is at a higher potential than the rim. (d) Current flows between C and the rim.

A conducting disc of radius r spins about its axis with an angular vel

1.	A conducting disc of radius r spins about its axis with an angular velocity ω. There is a uniform magnetic field of magnitude B perpendicular to the plane of the disc. C is the centre of the ring.(a) No emf is induced in the disc. (b) The potential difference between C and the rim is 1/2 Br2ω. (c) C is at a higher potential than the rim. (d) Current flows between C and the rim.
Answer» Correct Answer is: (b, c)

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