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  • 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 th

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?

Option: 1

At distance \frac{3 \mathrm{r}}{\pi} from the centre of loop


Option: 2

At distance \frac{2 \mathrm{r}}{\pi} from the centre of loop


Option: 3

At distance \frac{2 \mathrm{r}}{3 \pi}  from the centre of loop


Option: 4

Not possible


Answers (1)

best_answer

\mathrm{B=\frac{\mu_0 i}{2 r}=\frac{\mu_0(3 i)}{2 \pi d}}

\mathrm{d=\frac{3 r}{\pi}}

Posted by

Deependra Verma

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