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October 2, 2014

October 2, 2014

Posted by **Maria** on Wednesday, January 23, 2013 at 11:16am.

- Physics HELP!! -
**drwls**, Wednesday, January 23, 2013 at 12:45pmYou can treat the spheres as point charges at R >2m separation. If e is the charge on each sphere, for the electrical repulsion to equal the gravitational attraction,

G M^2 /R^2 = k Q^2/R^2

GM^2 = k Q^2

G is the Newton gravity constant and k is the Coulomb law constant

Solve for Q. The number of electrons is Q/e.

e is the elctron charge.

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