My textbook says electric potential (a scalar quantity) can be added together instead of vectorially adding the electric field to find the voltage when there are two fields. I am a little confused by this. In one example, two opposite charges (+/- 50 uC) of equal magnitude are seperated by a small distance (52cm). What is the voltage at a point equally distant from the two charges. According to the book, you would simply at the two potentials two get the a final answer of 0 V. This makes no sense to me at all, since the field line diagram shows that there is a force exerted at the point equidistant from both charges. So what is the problem here?