Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
A) F/2.
B) 2 F.
C) F.
D) F/4.
E) none of these

Question

Quizplus · Accepted Answer

According to Coulomb's law, the force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them. Doubling both charges increases the force by a factor of 4, and doubling the distance decreases the force by a factor of 4, resulting in the same force F.

Two Charged Particles Attract Each Other with a Force F