Physics-
General
Easy

Question

Two circular coils of radii 20cm and 30cm having number of turns 50 and 100 made of same material are connected in series. The ratio of the magnetic field of induction at their centres is

  1. 3:2    
  2. 9:4    
  3. 3:4    
  4. 1:3    

The correct answer is: 3:4

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