Example Find the electric potential at a distance of 2.56nm from a Carbon atom nucleus that has a positive charge equal to 6 electrons. Since potential is a scalar quantity, we do not need to take the directions into account. It is also easier to measure potential difference than use test charges to find electric field strength. Electric field lines start on positive charges and end on negative charges. Electric Field Strength is in N.C -1 .
E is a vector and V is a scalar.
Equipotentials are surfaces of equal potential at right angles to field lines.