Suppose a long wire of radius 'R' carries uniformly distributed current I. Find the magnetic field at point 'r' inside the wire.
1
\(\rm \frac{\mu_0I}{2\pi R}\)
2
\(\rm \frac{\mu_0I}{2\pi r}\)
3
\(\rm \frac{\mu_0Ir^2}{2\pi R^2}\)
4
\(\rm \frac{\mu_0IR}{2\pi R^2}\)