Cameroon GCE A-Level Physics

Practice session

Two point charges $q_1 = +4.0\,\mu\text{C}$ and $q_2 = -4.0\,\mu\text{C}$ are placed in vacuum separated by a distance of $0.20\text{ m}$. Taking $\frac{1}{4\pi\varepsilon_0} = 9.0 \times 10^9\text{ N m}^2\text{ C}^{-2}$, what is the magnitude of the electrostatic force between them?

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