A copper disc of radius 0.1 m rotates about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla. The emf induced across the radius of the disc is

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Solution

The correct option is C
The induced emf between centre and rim of the rotating disc is

$E = \frac{1}{2} B w R^{2} = \frac{1}{2} \times 0.1 \times 2 π \times 10 \times (0.1)^{2} = 10 π \times 10^{- 3}$ volt

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A copper disc of radius 0.1 m rotates about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla. The emf induced across the radius of the disc is

The correct option is C The induced emf between centre and rim of the rotating disc is E=12BwR2=12× 0.1× 2π× 10× (0.1)2=10π× 10−3volt

The correct option is C
The induced emf between centre and rim of the rotating disc is

$E = \frac{1}{2} B w R^{2} = \frac{1}{2} \times 0.1 \times 2 π \times 10 \times (0.1)^{2} = 10 π \times 10^{- 3}$ volt