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Two identical spherical water drops are picking up one monovalent ion.What weight has...

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nelleblue | Student, Grade 10 | eNotes Newbie

Posted June 28, 2009 at 9:04 PM via web

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Two identical spherical water drops are picking up one monovalent ion.

What weight has to have each drop so that the  gravitational force to balance coulomb rejection force?

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giorgiana1976 | College Teacher | Valedictorian

Posted June 29, 2009 at 2:56 AM (Answer #1)

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We'll use Newton's law,so we'll make an equality between the gravitational force and rejection force:

gama* m^2/r^2=e^2/4*pi*epsilon0*r^2

From this equality, we'll extract the weight:

m=e/ sqrt (4*pi*epsilon0*gama)=1.8ng

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