An equilateral triangle of side \( l \) is formed from a piece of wire of uniform resistance. Th...

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An equilateral triangle of side \( l \) is formed from a piece of wire of uniform resistance. The current \( i \) is fed as shown in the figure. The magnitude of the magnetic field at its centre \( O \) is
(A) \( \frac{\sqrt{3} \mu_{0} i}{2 \pi l} \)
(B) \( \frac{3 \sqrt{3} \mu_{0} i}{2 \pi l} \)
(C) \( \frac{\mu_{0} i}{2 \pi l} \)
(D) zero
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