3.2 Gauss’LaW This law relates the flux of e thru a closed surface to e charge Inside By using this law one can find e of simple charge dis tributions easily Let a point charge be at the point p inside the closed surface s. the flux of e thru a small element of area da is Q ri da Q a 4丌∈0 4∈0 Integrating over S yields /E·da=4丌e0 /ds 4丌 4丌∈0