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A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic induction at their centres will be :
2 : 1
1 : 4
4 : 1
1 : 2

A

2 : 1

B

1 : 4

C

4 : 1

D

1 : 2

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Solution

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Answer is B.

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