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.
What is the potential energy of a 3.2 nC charge placed at x = 0.5 m in units of nJ.