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. Now, if the charge are the same charge, they will push away. And that's the difference between electrical potential energy and gravitational potential energy. So let's look at what charge is.