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( 8.854*10^-12 * (6.624*10^-34)^2 ) / (PI * 9.109 * 10^-31 * (1.602*10^-19)^2 )
( 8.854*10^-12 * (6.624*10^-34)^2 ) / (PI * 9.109 * 10^-31 * (1.602*10^-19)^2 )
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