The surface charge density: S(igma) = Q / A A = 1.6 * 10^(-2) * 1.6 * 10^(-2) = 2.56 * 10^(-4) m² The electric field: E = S / E(psilon) o E = 0.711 * 10^^(-9) / ( 2.56 * 10 ^(-4) * 8.85 * 10 ^(-12) ) = = 0.3138 * 10 ^6 = 3.138 * 10^5 V/m a ) Δ V = E d Δ V = 3.138 * 10^5 V/m* 1.2 * 10^(-3) m = 376.56 V b ) When d = 2.40 mm: Δ V = 3.138 * 10^5 V/m * 2.40 *10^(-3) m = 753.12 V