What is the electric force between a +2 µC point charge and a –2 µC point charge if they...?

Question

Can someone show me how to work this out? The faster the better, 10 points to best! Thanks.

What is the electric force between a +2 µC point charge and a –2 µC point charge if they are separated by a distance of 5.0 cm? Show your work. (µC = 1.0 × 10–6 C)

Answer 1

F = -kQ1Q2/r^2

This is coulomb's law



k = 9 x 10^9



F = 9x10^9(2x10^-6)^2/(0.05)^2

F = 14.4 N

Answer 2

These charges are attracting therefore use Coulomb's law



K_e*|q_a||q_b|/r^2 as exactly 14.38008285978908224 Newtons

Answer 3

E=mc^2