After brushing, Fluffy's fur has a charge of +8.0 * 10È© coulombs and her plastic brush has a charge of -1.4 * 10È§ coulombs. If the distance between the fur and brush is roughly 5.0 * 10È¹ meters, what is the approximate magnitude of the force between them?
(k = 9.0 * 10© newton·metersÆ/coulombÆ)

Question

After brushing, Fluffy's fur has a charge of +8.0 * 10È© coulombs and her plastic brush has a charge of -1.4 * 10È§ coulombs. If the distance between the fur and brush is roughly 5.0 * 10È¹ meters, what is the approximate magnitude of the force between them?
(k = 9.0 * 10© newton·metersÆ/coulombÆ)

anonymous · Answer

Recall Coulomb's law: $$F=\frac{ k q _{1}q _{2} }{ r ^{2} }$$ Just plugin the values and solve for force.