work done by the electrice force on unite charge is W=
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W = ∫Fext·dr= -q∫E·dr. The work done by the external force is equal to the change in the electrostatic potential energy of the particle in the external field. The change in the potential energy of a charge q when being moved from point A to point B, is the work done by an external force in moving the charge.
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fdcosO
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