A long conducting cylinder having a radius 'b' is placed along the z axis. The current density is \(\vec{J} = J_s r^3 \hat{z} \) for the region r< b where r is the distance in the radial direction. The magnetic field intensity (H) for the region inside the conductor (i.e., for r
1
\(\frac{J_s}{4} r^4 \)
2
\(\frac{J_s}{3} r^3 \)
3
\(\frac{J_s}{5} r^4 \)
4
\(J_s r^3 \)