An infinite, nonconducting, flat sheet carries a uniform positive surface charge density \(\sigma\). Points \(A\) and \(B\) are located on the same side of the sheet at perpendicular distances \(x_1\) and \(x_2\) from the sheet, respectively, where \(x_2 > x_1\). What is the magnitude of the electric potential difference \(\Delta V = |V_B - V_A|\) between points \(A\) and \(B\)?