A copper disc of the radius 0 . 1 m is rotated about its centre with ω = 20 revolutions per second in a uniform magnetic field of 0 . 1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is

Question

A copper disc of the radius 0 . 1 m is rotated about its centre with ω = 20 revolutions per second in a uniform magnetic field of 0 . 1 T with its plane perpendicular to the field. The emf induced across the radius of the disc is, π 2 0 V, π 10 V, 20 π mV, 100 π mV

MARKS App · Accepted Answer

ε = B ω R 2 2 = 0.1 × 2 π × 2 0 0.1 2 2 = 2 0 π × 1 0 - 3 V

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