74. The insulated metal disk of radius a = 0.250 m rotates at n = 1000 min-1. Find the potential difference U between the center and the edge of the disc, arising:
a) in the absence of magnetic fields,
b) In the case where there is a disk perpendicular to the uniform field induction B = 10.0 mT.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)