OR (b) (i) State Gauss's Law in electrostatics. Apply this to obtain the electric field $\vec{E}$ at a point near a uniformly charged infinite plane sheet. (ii) Two long straight wires 1 and 2 are kept as shown in the figure. The linear charge density of the two wires are $\lambda_1 = 10 \ \mu\text{C/m}$ and $\lambda_2 = -20 \ \mu\text{C/m}$. Find the net force $\vec{F}$ experienced by an electron held at point P.