In class XI, the notion of potential energy was introduced. When a body is taken from a potential energy was introduced. When a body is taken from a point to another against a force ( like spring force) the work done gets stored as potential energy of the body. When the external force is removed, the body retraces its path, gaining kinetic energy and losing an equal amount of potential enrgy. The sum of kinetic and potential enrgies is thus conserved. Forces of this kind are called conserved forces. Spring force and gravitational force are expamples of conservative forces.
Coulomb force between two (stationary) charges, like the gravitational force, is also a conservative force. Thus, like the potential energy of a mass in a gravitational field, we can define electrostatic potential energy of a charge in an electrostatic field.
Coulomb force between two (stationary) charges, like the gravitational force, is also a conservative force. Thus, like the potential energy of a mass in a gravitational field, we can define electrostatic potential energy of a charge in an electrostatic field.
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