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Two circular coils are made of two ident...

Two circular coils are made of two identical wires of same length and carry same current. If the number of turns of the two coils are 4 and 2, then the ratio of magnetic induction at the centres will be

A

`4:1`

B

`1:4`

C

`1:2`

D

`2:1`

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A
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