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F = \frac{1}{4 π \in_{0}}, \frac{q_{1} q_{2}}{d^{2}}

F = \frac{1}{4 π \in_{0} K}, \frac{q_{1} q_{2}}{d^{2}}

F=qE

F = \frac{1}{4 π_{7} \in_{0}}, \frac{d^{2}}{q_{1} q_{2}}

ANS : 4

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