Hello everyone, I've been having the hardest time getting the hang of coulobs law. I got a physics book, physics for complete morons. The question is simple enough: Consider a line of charges, q1 = 8.0 micro C at the orginin, q2 = -12 micro C at 2.0 cm, and q3 = 10 micro C at 4.0cm. What is the force on q3 due to the ohter two charges? So you find F31 and u find the F32 and then add up the two forces to find your answer. But to find F31 they used a distance of .04m which confuses me. If the charges are as follows: (q1)---(q2)-------(q3) .02m .04m Why wouldn't the distance from q1 to q3 be .06m? Thanks.