The thin plastic rod of length L = 10.0 cm in Figure has a non-uniform linear charge density ? = cx, where c = 49.9pC/m2.
(a) With V = 0 at infinity find the electric potential at point P2 on the y axis at y = 3.56cm.
(b) Find the electric field component Ey at P2.
(c) Why cannot the field component Ex at P2 be found using the result of (a)?