Question
Two charges, +3 µC and –3 µC, are placed 1 m apart
in vacuum. What is the electrostatic potential energy of the system?Solution
The electrostatic potential energy (U) of a system of two-point charges q ₁ and q ₂ separated by a distance r is given by the formula: 
The electrostatic potential energy of the system is approximately −0.081J.
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