A short section of coaxial cable consists of a line currentalong the z-axis from z = -L to z = L carrying current ?0?̂surrounded by a hollow cylindrical shell (centered on the z-axis,top at z = L , bottom at z = -L) carrying a surface current ?⃗⃗ =?0 (−?̂). Radius R
a. Find an expression for the magnetic field at an arbitrarypoint (x, y, z)
b. Draw a qualitative graph of the magnetic field as a functionof position on the x-axis.
