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A 16cm^(2) coil has 20 turns. It is susp...

A `16cm^(2)` coil has `20` turns. It is suspended by a phosphor bronze wire of `10^(-0)Nm` per degree as couple per unit twist. When `i` ampere is passing through it, in a `0.2T` field, the wire twisted by `45^(@)` .The value of `i` is?
1.`7times10^(-3)A`
2.`8times10^(-1)A`
3.`7times10^(-2)A`,
4.`4A`

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