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2. Electric potential energy (U) of two
point charges is
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Therefore, we can write a general expression for the potential energy of two point charges (in spherical coordinates): ΔU=−∫rrrefkqQr2dr=−[−kqQr]rrref=kqQ[1r−1rref]. ... This formula is symmetrical with respect to q and Q, so it is best described as the potential energy of the two-charge system.
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Recall that the electric potential is defined as the potential energy per unit charge, i.e. V=PEq V = PE q . The potential difference between two points ΔV is often called the voltage and is given by ΔV=VB−VA=ΔPEq Δ V = V B − V A = Δ PE q .
Explanation:
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