Physics

Problem

Which of the following expressions correctly represents the magnitude

F

of the electrostatic force between two point charges

q_1

and

q_2

separated by a distance

r

in vacuum? a)

F = k \dfrac{(q_1 + q_2)^2}{r^2}

F = \dfrac{k q_1 q_2}{2 r^2}

F = k \dfrac{q_1 q_2}{r^2}

F = k \dfrac{q_1^2 + q_2^2}{r^2}