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  4. Force between two charges q1 and q2 separated by a distance r is proportional to q1 q2 / r2. Proportionality constant is

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Q. Force between two charges $q_{1}$ and $q_{2}$ separated by a distance $r$ is proportional to $q_{1} q_{2} / r^{2}$. Proportionality constant is

Electric Charges and Fields

Solution:

Correct answer is (c) $\frac{1}{4 \pi \varepsilon_{0}}$