1. The problem statement, all variables and given/known data F=(KQ1Q2)/r^2 • (r-hat) Why are we multiplying by r-hat? I understand that the equation helps us calculate the force between two charges. The book says that r=|r(bold)| I know that this is the magnitude sqrt(rx^2+ry^2+rz^2) rx= r with respect to the X position and so on. But we can neglect z since the charges are not in the k direction Why does r=|r(bold)|? If the charges has the same charge then it's just F=(KQ^2)/r^2 • (r-hat) Why are we multiplying by r-hat? Then I am also given another equation F=(KQ1Q2) •(x1-x2)/(|x1-x2|^3) Why did we get rid of r^2 and multiply by the unit vector ? 2. Relevant equations None 3. The attempt at a solution I just have question to better understand. Sorry if this is a stupid question.