Electromagnetic Induction

A disc of \(10.0 \mathrm{~cm}\) diameter is rotated at speed of \(3600 \mathrm{~rpm}\) inside a long solenoid of 1200 turns per metre on the axis of the solenoid and perpendicular to the plane of the disc. When a current of \(1.5 \mathrm{~A}\) is passed through the solenoid, the difference in the potential between axes and circumference of the disc is nearly