A line of charge, with a charge density of 10 C/m , is surrounded by a conductor in the form of a thin cylinder with a radius of 5 cm, and its axis coincides with the line of charge . If the thin cylinder is initially uncharged, determine: a. The charge density of the outer shell and the inner shell of a thin cylinder b. The electric field at a point , whose perpendicular distances to the line of charge are 3 cm and 10 cm.