An infinite sheet of charge that has a surface charge density of 28 nC/m2 lies in the yz plane, passes through the origin, and is at a potential of 0.8 kV. A long wire having a linear charge density of 116 nC/m lies parallel to the y axis and intersects the x axis at 2m.
Electric field on x-axis due to infinite sheet:
E(sheet) = s/2*ep
where, s (== sigma = surface charge density) =28 nC/m^2 =28*10^(-9) C
ep (== epsilon zero) = 8.86*10^(-12) C^2/N-m^2
E = 28*10^(-9)/(2*8.86*10^(-12)) = 1.58*10^3 V/m
dV = -E*dx
=> V = -E.x + constant
With good explanations, the formulas and calculations are shown in solving the problem.