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Obtain equation of electric energy of a single charge . |
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Answer» Solution :The external ELECTRIC field `vecE` and the corresponding external POTENTIAL V may vary from point to point. According to definition of electric potential V at a point P is the WORK done in BRINGING a unit positive charge from infinity to the point P (We assume the potential at infinity to be zero.) Thus, work done in bringing a charge q from infinity to the point P in the external field is W =qV. This work is stored in the form of potential energy of q , `:. U =qV` If the point P has position vector `vecr` relative to ORIGIN, then potential energy at point P `U(vecr)=qV(vecr)` Means potential energy in an external field = electric charge `xx` electric potential in external field. |
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