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in Physics by (87.2k points)
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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