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of the two charges Q₂ and Q₃.

The electrostatic potential energy stored in the system of three charges is:

+ \frac{1}{4\pi\varepsilon_0} \frac{Q_3}{r_{13}}

Where r_ij is the distance between charge Q_i and Q_j.

If we add everything:

Finally, we get that the electrostatic potential energy stored in the system of three charges:

}}

Energy stored in an electrostatic field distribution in vacuum

The energy density, or energy per

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