Click Start to begin the exercise. You will see two fixed charges shown in black along with a small green test charge. A force vector attached to the test charge indicates the net force on it due to the two black charges. Click-drag the small green test charge around the screen and observe how the force vector changes magnitude and direction. The coordinates of the test charge (in meters) and the magnitude of the force on the test charge (in Newtons) are shown in the yellow box which appears when you click-drag.
Determine the magnitude and sign of the black charge on the right if the black charge on the left has a value of +3 microcoulombs.
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