Two identical spherical water drops are picking up one monovalent ion.What weight has to have each drop so that theĀ  gravitational force to balance coulomb rejection force?

Asked on by nelleblue

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giorgiana1976 | College Teacher | (Level 3) Valedictorian

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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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