A conducting wire is in the shape of a regular hexagon which is inscribed inside an imaginary circle of radius R. If a current I flows the wire, the magnitude of magnetic field at the centre of the circle is
1
\(\frac{\mu_0 J}{2 \sqrt{3} \pi \mathrm{R}}\)
2
\(\frac{\sqrt{3} \mu_0 J}{2 \pi \mathrm{R}}\)
3
\(\frac{3 \mu_0 J}{2 \pi \mathrm{R}} \)
4
\(\frac{\sqrt{3} \mu_0 J}{\pi \mathrm{R}}\)