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Question

Two wires A and B are of lengths 40cm and 30cm. A is bent into a circle of radius r and B into an arc of radius r. A current i subscript 1 end subscript is passed through A and i subscript 2 end subscript through B. To have the same magnetic inductions at the centre, the ratio of i subscript 1 end subscript colon i subscript 2 end subscript is

  1. 3:4    
  2. 3:5    
  3. 2:3    
  4. 4:3    

The correct answer is: 3:4

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