Difficult
Three point charges $1 \ C$,$-2 \ C$,and $-2 \ C$ are placed at the vertices of an equilateral triangle of side $1 \ m$. The work done by an external force to increase the separation of the charges to $2 \ m$ in joules is ($\varepsilon_0 =$ permittivity of air).
- A$\frac{1}{4 \pi \varepsilon_0}$
- B$\frac{1}{8 \pi \varepsilon_0}$
- C$\frac{1}{16 \pi \varepsilon_0}$
- D$0$
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