Three point charges are arranged in a straight line. The point charges are q1 = –10.0 μC, q2 = 20.0 μC, and q3 = –10.0 μC. Charge q1 is 20.0 cm from charge q2, and charge q3 is 10.0 cm from charge q2. Determine the magnitude of the net electric force on charge q1.

The magnitude of the net electric force on charge q1 is

N.