A small plastic sphere charged to -10 nC is held 1.0 cm above a small glass bead at rest on a table. The bead has a mass of 15 mg and a charge of +10 nC. Will the glass bead be moved up to the plastic sphere? What is the mass of the bead that just balances the gravitational and electric forces between the plastic sphere and the glass bead?
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10384 cm
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