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Two wires A and B are of lengths 40 cm a...

Two wires A and B are of lengths 40 cm and 30 cm. A is bent into a circle of radius r and B into an arc of radius r. A current `i_(1)` is passed through A and `i_(2)` through B. To have the same magnetic induction at the centre, the ratio of `i_(1)` : `i_(2)` is

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