A small plastic sphere is charged to -10 nC. It 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 “leap up” to the plastic sphere?
F1F2=kq1q2r2mg=60>1,\frac{F_1}{F_2}=\frac{kq_1q_2}{r^2mg}=60>1,F2F1=r2mgkq1q2=60>1, yes.
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