Three charges, +q, +q and -q, are placed at the vertices of an equilateral triangle of side 0.2 m. If q = 2 µC, the total electrostatic potential energy of the system is:

Field lines always point from positive to negative charge, are denser where the field is stronger, and never cross; an isolated positive charge has lines radiating symmetrically outward, while a dipole's lines curve from the positive to the negative charge.