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  1. Black Selena

    Tính tỉ số q1/q2??

    $\dfrac{T}{T1}= \sqrt{1-\dfrac{\left|q1 \right|E}{mg}}\Rightarrow \dfrac{\left|q1 \right|E}{mg}=\dfrac{8}{9} \dfrac{T}{T2}=\sqrt{1+\dfrac{\left|q2 \right|E}{mg}}\Rightarrow \dfrac{\left|q2 \right|E}{mg}=8 \Rightarrow \dfrac{\left|q1 \right|}{\left|q2 \right|}=\dfrac{1}{9} \Rightarrow...
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