Acylindrical shell of radius 7.00cm and length 2.40m has its charge uniformly distributed on its curved surface. the magnitude of the electric field at a point 19.0cm radially outward from its axis (measured from the midpoint of the shell) is 36.0kn/c.


(a) the net charge on the shell, and
(b) the electric field at a point 4.00cm from the axis, measured radially outward from the midpoint of the shell.