Q .     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 inductions at the centre, the ratio of `i_1:i_2` is

EAMCET 2007
A

`3 : 4`

B

`3 : 5`

C

`2 : 3`

D

`4 : 3`

HINT

Use `B=(mu_0i)/(2r)`

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