Electric potential at a point ' P ' due to a point charge of $5 \times 10^{-9} \mathrm{C}$ is 50 V . The distance of ' P ' from the point charge is: (Assume, $\frac{1}{4 \pi \varepsilon_0}=9 \times 10^{+9} \mathrm{Nm}^2 \mathrm{C}^{-2}$ )
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