On a square wireframe with side length a in empty space, there is a linear charge density ρl. Calculate the value of the potential V = ke · ρl · A [Volt] at h = 5 · a height on the strut exiting the center of this square frame. Find the numerical value of the value of A?

Consider an infinite plane with a uniform charge density of +7.3 x 10-12 C/m2.  Let point A = (0, 0, 18.0 m) and point B = (0, 0, 4.5 m).  Calculate the potential difference VB - VA, in V.  Use ?0ε0 = 8.85 x 10-12 F/m. (Please answer to the fourth decimal place - i.e 14.3225)

Two identical balls each having a density pare suspended from a common point by two insulating strings of equal length. Both the balls have equal mass and charge. In equilibrium, each string makes an angle with the vertical. Now, both the balls are immersed in a liquid. As a result, the angle does not change. The density of liquid is o. Find the dielectric constant of the liquid.

Consider an infinite plane with a uniform charge density of +6.8 x 10-12 C/m2.  Let point A = (0, 0, 11.0 m) and point B = (0, 0, 6.4 m).  Calculate the potential difference VB - VA, in V.  Use ?0ε0 = 8.85 x 10-12 F/m. (Please answer to the fourth decimal place - i.e 14.3225)