A conducting wire is bent in the form of a n sided regular polygon...

Options

1. A$\frac{\mu_0 i}{2 R} \frac{\sin \frac{\pi}{n}}{\frac{\pi}{n}}$
2. B$\frac{\mu_0 i}{2 R} \frac{\cos \frac{\pi}{n}}{\frac{\pi}{n}}$
3. C$\frac{\mu_0 i}{2 R} \frac{\tan \frac{\pi}{n}}{\frac{\pi}{n}}$
4. D$\frac{\mu_0 i}{2 R} \frac{\cot \frac{\pi}{n}}{\frac{\pi}{n}}$