. A direct current is passing through a wire. It is bent to form a coil of one turn. Now it is further bent to form a coil of two turns but at smaller r


A direct current is passing through a wire. It is bent to form a coil of one turn. Now it is further bent to form a coil of two turns but at smaller radius. The ratio of the magnetic induction at the centre of this coil and at the centre of the coil of one turn is
 

  • (A):1 : 4
  • (B):4 : 1
  • (C):2 : 1
  • (D):1 : 1

Best Answer

Correct Answer:

(B): 4 : 1

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