Physics-
General
Easy

Question

A uniform but time varying magnetic field B (t) exists in a circular region of radius a is directed into the plane of the paper as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region.

  1. is zero    
  2. decreases as 1/r    
  3. increases as r    
  4. decreases as 1/r    

The correct answer is: decreases as 1/r

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