a circular copper disc 10 cm in radius rotates at 20 pie rad/s about an axis through its centre& perpendicular to the disc. a uniform magnetic field of 0.2 T acts perpendicular to the disc.
(a) calculate the potential difference developed between the axis of the disc and rim.
(b) what is the induced current in the circuit whose terminalsare connected betwencentre of the disc and point of rim and the resistance of the circuit is 0.2ohm?

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