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The coils A and B having the radii in the ratio `1:2` carrying currents in the ratio `5:1` and have the number of turns in the ration `1:5` . The ratio of magnetic inductions at their centres is `

A

`1:2`

B

`2:1`

C

`1:5`

D

`5:1`

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The correct Answer is:
2
`B prop (n i)/( R)`
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