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A metal disc of radius R = 25 cm rotates...

A metal disc of radius `R = 25 cm` rotates with a constant angular velocity `omega = `130` rad `s^(-1)` about its axis. Find the potential difference between the center and rim of the disc if
(a) the external magnetic field is absent,
(b) the external uniform megnetic field `B = 5.0`mT directed perpendicular to the disc.

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