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A uniform magnetic field of 0.4 T acts perpendicular to a circular copper disc 20 cm in radius. The disc is having a uniform anglar velocity of 10 π rad s -1 about an axis through its centre and perpendicular to the disc. What is the protential difference developed between the axis of the disc and the rim ? ( π = 3.14)

1. 0.0628 V
2. 0.5024 V
3. 0.2512 V
4. 0.1256 V

Correct answer: 0.2512 V

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