Click Start to begin the exercise. You will see four unknown charges. Each charge has a force vector attached to it whose length represents the magnitude of the net force on the charge due to the other three charges. You can click-drag on any charge to change its position (x and y in meters).
Your task is to determine how many of the charges have like signs. (HINT: Move any two charges close together and observe the forces.)
Submit your answer in the form below.