A current of I ampere flows along an infinitely long straight thin walled hollow metallic cylinder of radius r. The magnetic field at any point inside the cylinder at a distance x from the axis of the cylinder is
1
\(\infty\)
2
\(\frac{{{\mu _0}I}}{{2\pi r}}\)
3
\(\frac{{{\mu _0}I}}{{2\pi x}}\)
4
0