Which factors affect the strength of the interaction between two objects with electrical charges?

Choose all answers that are correct.

A.
the speed at which the objects move

B.
the distance between the objects

C.
how much charge the objects have

D.
the force the objects exer

Question

Which factors affect the strength of the interaction between two objects with electrical charges?

Choose all answers that are correct.
 
 A.
the speed at which the objects move
 
 B.
the distance between the objects
 
 C.
how much charge the objects have
 
 D.
the force the objects exer

anonymous · Answer

a and b

anonymous · Answer

The formula for the electrical force between two charged particles $q_1$ and $q_2$ is 
$$F=k\frac{q_1 q_2}{r^2}$$

So the speed has no effect, but the distance between the two objects (B) and the charge of both particle (C) do have an effect on the electrical force. (D) seems incomplete.