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Two concentric coplaner circular loops o...

Two concentric coplaner circular loops of radii `r_(1)` and `r_(2)` carry currents of respectively `i_(1)` and `i_(2)` in opposite directions (one clockwise and the other anticlockwise .) The magnetic induction at the centre of the loops is half that due to `i_(1)` alone at the centre . If `r_(2)=2r` , the value of `i_(2)//i_(1)` is

A

`120mu_(0)T`

B

`480mu_(0)T`

C

`80mu_(0)T`

D

`420mu_(0)T`

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The correct Answer is:
D
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