$A$ point charge $A$ of $+10 \mu C$ and another point charge $B$ of $+20 \mu C$ are kept $1 \ m$ apart in free space. The electrostatic force on $A$ due to $B$ is $F_1$ and the electrostatic force on $B$ due to $A$ is $F_2$. Then:
- A$F_1 = -2 F_2$
- B$F_1 = -F_2$
- C$2 F_1 = -F_2$
- D$F_1 = F_2$
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