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خطا

$S=9\,\,\,\,\,\,\,\,\,\,\,\,{{S}_{1}}=3$  ${{S}_{\overset{\Delta }{\mathop{MQE}}\,}}=\frac{mQ\times QE}{2}=3\Rightarrow 3\times QE=6\Rightarrow QE=2$ $E{{F}^{2}}={{1}^{2}}+{{1}^{2}}\Rightarrow EF=\sqrt{2}$