A point charge is surrounded symmetrically by six identical charges at distance $r$ as shown in the figure. How much work is done by the forces of electrostatic repulsion when the point charge $q$ at the centre is removed at infinity
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Work done by electrostatic force
$=-\Delta \mathrm{U}=\mathrm{U}_{i}-\mathrm{U}_{\mathrm{f}}=\frac{6 \mathrm{Kq}^{2}}{\mathrm{r}}-0$
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