Two infinitely long parallel conducting plates having surface charge densities +σ  and  -σ, respectively, are separated by a small distance. The medium between the plates is vacuum. If £o is the dielectric permittivity of vacuum, then the electric field in the region between the plates is

Given that conducting plates have surface charge densities +σ  and  -σ, respectively. Since the sheet is large, the electric field E at any point near the sheet will be perpendicular to the sheet.If σ is surface charge density then, electric field between the plates=σ2ε0+σ2ε0 =σε0 volt/metre