Question:Two point charges \(100\,\mu \,C\) and \(5\,\mu \,C\) are placed at points \(A\) and \(B\) respectively with \(AB = 40\,cm\). The work done by external force in displacing the charge \(5\,\mu \,C\) from \(B\) to \(C\), where \(BC = 30\,cm\), angle \(ABC = \frac{\pi }{2}\) and \(\frac{1}{{4\pi {\varepsilon _0}}} = 9 \times {10^9}N{m^2}/{C^2}\)