After brushing, Fluffy's fur has a charge of +8.0 x 10^-9 coulombs and her plastic brush has a charge of -1.4 x 10^-8 coulombs. If the distance between the fur and brush is roughly 5.0 x 10^-1 meters, what is the approximate magnitude of the force between them?
(k = 9.0 x 10^9 newton·meters^2/coulomb^2)

Question

After brushing, Fluffy's fur has a charge of +8.0 x 10^-9 coulombs and her plastic brush has a charge of -1.4 x 10^-8 coulombs. If the distance between the fur and brush is roughly 5.0 x 10^-1 meters, what is the approximate magnitude of the force between them?
(k = 9.0 x 10^9 newton·meters^2/coulomb^2)

matt101 · Answer

Use Coulomb's Law to figure this one out:

$$F={kq_1q_2 \over r^2}$$