a. Two charges, one of +5 x 10-7 C and the other of -2 x 10-7 C, attract each other with a force of 100N. How far apart are they? b. Two positive point charges, q1=+16μC and q2=+4.0μC are separated in a vacuum by a distance of 3.0m. Find the spot on the line between the charges where the net electric field is