Exploration 22.1: Equilibrium

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Two fixed charges and a dragable test charge are placed as shown (position is given in meters and force is given in newtons).  The blue arrow represents the force on the red test charge.  The forces on the fixed charges are not shown.  You can examine the forces with the first fixed charge, with the second fixed charge, or with both fixed charges in place.  Notice that the net force on the test charge is displayed in the yellow message box when you have only one charge present but not when you have both charges present. Restart. 

Answer the following questions with both fixed charges in place.

1. Determine the net force on the test charge at the point (3 m,4 m).
2. Determine the net force on the test charge at a point midway between the two charges.
3. Is (are) there any point(s) where the net force on the test charge is zero? If so, find those points.
4. What is the ratio of the charges?

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