A current of $i$ ampere is flowing in an equilateral triangle of side $a$. The magnetic induction at the centroid will be
A current of $i$ ampere is flowing in an equilateral triangle of side $a$. The magnetic induction at the centroid will be
- A
$\frac{\mu_0 i}{3 \sqrt{3} \pi a}$
- B
$\frac{3 \mu_0 i}{2 \pi a}$
- C
$\frac{5 \sqrt{2} \mu_0 i}{3 \pi a}$
- D
$\frac{9 \mu_0 i}{2 \pi a}$
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- [AIIMS 2009]
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