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U1 = -((0.0015*0.0015*10^(-18))/r^6) + 1.1552*10^(-19) (0.010 + 0.010)*Exp[(0.10 + 0.10 - r)/(0.010 + 0.010)]
     Plot[U1, {r, 1, 4}]
   FindRoot[ӘrU1== 0, {r, 3}]
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2Â¥: Originally posted by kabaisun at 2014-09-25 08:27:39
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