A) decreases
B) increases
C) remains same
D) becomes zero
Correct Answer: B
Solution :
The electron has negative charge. When an electron is bringing towards another electron, then due to same negative charge repulsive force is produced between them. So, to bring them closer a work is done against this repulsive force. This work is stored in the form of electrostatic potential energy. Thus, electrostatic potential energy of system increases. Alternative: Electrostatic potential energy of system of two electrons \[U=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{(-e)(-e)}{r}=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{{{e}^{2}}}{r}\] Thus, as r increases, potential energy U increases.
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