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(B) The electron has a negative charge. When an electron approaches another electron,a repulsive force is produced between them due to their like char

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increases

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(B) The electron has a negative charge. When an electron approaches another electron,a repulsive force is produced between them due to their like charges. To bring them closer,work must be done against this repulsive force. This work is stored in the system in the form of electrostatic potential energy. Thus,the electrostatic potential energy of the system increases. Alternatively,the electrostatic potential energy $U$ of a system of two electrons is given by: $U = \frac{1}{4 \pi \varepsilon_{0}} \frac{(-e)(-e)}{r} = \frac{1}{4 \pi \varepsilon_{0}} \frac{e^{2}}{r}$ As the distance $r$ decreases,the potential energy $U$ increases.

In bringing an electron towards another electron,the electrostatic potential energy of the system

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