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Jean Marie Laborde (the creator of Cabri Géomètre) has shown how to model force fields. These two sketches demonstrate the techniques.
Here a capacitor is modeled with five positive charges on one side and five negative ones on the other. You can "see" the nearly uniform field between the two rows of charges. Here's a picture of the sketch:
A test charge is moved around in the presence of fixed positive and negative charges. This is an idea of the sketch:
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