The magnetic field at point P of given figure due to carrying of current I by a conductor of radius R, is
1
\(\rm\frac{\mu_0I}{4\pi r}\)
2
\(\rm\frac{\mu_0I}{2\pi r}\)
3
\(\rm \frac{\mu_0I}{2\pi R}\)
4
\(\rm\frac{\mu_0I}{4\pi R}\)
The magnetic field at point P of given figure due to carrying of current I by a conductor of radius R, is