A circular loop of radius \( \mathrm{r} \) carries a current i. How...

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A circular loop of radius \( \mathrm{r} \) carries a current i. How should a long, straight wire carrying a current \( 3 \mathrm{i} \) be placed in the plane of the circle so that the magnetic field at the centre of the loop becomes zero?
(A) At distance \( \frac{3 r}{\pi} \) from the centre of loop
(B) At distance \( \frac{2 r}{\pi} \) from the centre of loop
(C) At distance \( \frac{2 r}{3 \pi} \) from the centre of loop
(D) Not possible
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