This problem looked so easy at first: Two opposite charges of equal magnitude 7e-07 C are held on an x axis 0.7 m apart, with the negative charge on the right. What are the magnitude and direction of E at the point midway between charges? I had the idea that I would solve this by summing up the electric fields. Et = E1 + E2 and E = kq/r^2 I started to do the numbers, then stopped when it become very obvious that since the two charges were equal but opposite in charge, the electric field midway would have to be zero, as we would have two equal electric fields cancelling eachother out. But the online homework marker says it isn't zero. What part of my assumption is wrong?