So electrical potential energy is similar to gravitational potential energy. So we know that any two objects say this marker and this marker will pull each other and this pull will be due to their masses. And the pull or the force is given by the gravitational constant. Time mass one times mass two divided by the distance between them. Now, the electrical potential energy is similar to this concept, except now they will pull each other not due to mass, but due to charge. So if this object has a charge one and this object has charge two, and their charges are opposite, then they will pull each other.