. A metal disc rotates freely, between the poles of a magnet in the direction indicated. Brushes P and Q make contact with the edge of the disc and the


A metal disc rotates freely, between the poles of a magnet in the direction indicated. Brushes P and Q make contact with the edge of the disc and the metal axle. What current, if any, flows through R
                

  • (A):A current from P to Q
  • (B):A current from Q to P
  • (C):No current, because the e.m.f. in the disc is opposed by the back e.m.f
  • (D):No current, because no radial e.m.f. induced in the disc

Best Answer

Correct Answer:

(A): A current from P to Q

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