« · »

Java Security Update: Oracle has updated the security settings needed to run Physlets.
Click here for help on updating Java and setting Java security.

Exploration 22.1: Equilibrium

Please wait for the animation to completely load.

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?

Download PDF Worksheet

The OSP Network:
Open Source Physics - Tracker - EJS Modeling
Physlet Physics
Physlet Quantum Physics