A current \( I \) is flowing in a hexagonal coil of side \( a \) Fi...

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A current \( I \) is flowing in a hexagonal coil of side \( a \) Fig. The magnetic field induction at the centre \( O \) of the coil will be
(a) \( \frac{\mu_{0} I}{3 \sqrt{3} \pi a} \)
(b) \( \frac{\sqrt{3} \mu_{0} I}{\pi a} \)
(c) \( \frac{3 \sqrt{3} \mu_{0} I}{\pi a} \)
(d) \( \frac{\mu_{0} I}{\sqrt{3} \pi a} \).
\( \mathrm{P} \)
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