If no work is done in moving a charge from one point to another, there is no change in the electrical potential between those points. It is useful to map out lines along which a charge can move with no electrical work being done. These are call equipotential lines.    Consider two large plates, one charged positively and one charged negatively, as in the diagram below.  a. Draw the charge distribution on the plates.  b. Draw the electric field lines in the diagram.  c. Predict the lines of equal potential by drawing them in the diagram. Discuss why you drew them the way you did and how they are related to the electric field lines you drew.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.