Q4 (25) Marks:
Three infinite uniform sheets of charge are located in free space as follows:
5 nC/m² at y = 4, 8 nC/m² at y = -1, and -10 nC/m² at y = 4.
a) Find E at the point P(-2, -5, 5).
b) If one point charge Q (C) is located at (2, 3, 0). To what value of Q to cause $E_z$ to be zero
at P.