Write an expression for a linearly polarized lightwave of angular frequency  and amplitude E propagating along a line in the xy-plane at 45 degree to the x-axis and having its plane of vibration corresponding to the xy plane. At t=0, y=0, and x=0 the field is zero

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

d) physical means can be used to separate the components of air.