Electric Potential Energy
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المؤسسة العامة للتعليم الفني والتدريب المهني
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مقدمة عن علم الكهربية الساكنة
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16-2-2017
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Electric Potential Energy
The definition of the electric potential energy of a system of charges is the work required to bring them from infinity to that configuration.
To workout the electric potential energy for a system of charges, assume a charge q2 at infinity and at rest as shown in figure 1.1. If q2 is moved from infinity to a distance r from another charge q1, then the work required is given by
Substitute for V in the equation of work
To calculate the potential energy for systems containing more than two charges we compute the potential energy for every pair of charges separately and to add the results algebraically.
If the total electric potential energy of a system of charges is positive this correspond to a repulsive electric forces, but if the total electric potential energy is negative this correspond to attractive electric forces.
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