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\vec{F} = \frac{1}{4 π \in_{0}} \frac{Q_{1} Q_{2}}{r^{2}}

\vec{F} = \frac{1}{4 π \in_{0}} \frac{\vec{Q_{1}} \vec{Q_{2}}}{r^{2}}

\vec{F} = \frac{1}{4 π \in_{0}} \frac{\vec{Q_{1}} \vec{Q_{2}}}{r^{3}} \vec{r}

\vec{F} = (\frac{1}{4 π \in_{0}} \frac{\vec{Q_{1}} \vec{Q_{2}}}{r^{3}}) \times \vec{r}

\vec{F} = \frac{1}{4 π \in} \frac{Q_{1} Q_{2}}{r^{2}}

ANS : 4

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