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\frac{1}{4\pi *8.85*10^{-12}}*\frac{24*10^{-6}*(-18*10^{-6})}{0.06^{2}}
\frac{1}{4\pi *8.85*10^{-12}}*\frac{24*10^{-6}*(-18*10^{-6})}{0.06^{2}}
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