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A circular loop of radius r carries a cu...

A circular loop of radius `r` carries a current `i`.How should a long, straight wire carrying a current `3i` be placed in the plane of the circle so that the magnetic field at the centre of the loop becomes zero?

A

At at distances `(3r)/pi` from the centre of loop

B

At at distances `(2r)/pi` from the centre of loop

C

At at distances `(2r)/(3pi)` from the centre of loop

D

Not possible

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The correct Answer is:
A
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