A cylindrical shell of radius 7.00 cm and length 240 cm has its charge uniformly distributed on its curved surface. The magnitude of the electric field at a point 19.0 cm radially outward from its axis (measured from the midpoint of the shell) is 36.0 kN/C find
(a) The net charge on the shell and
(b) The electric field at a point 4.00 cm from the axis, measured radially outward from the midpoint of the shell.