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.
B)2 F.
C)F/2.
D)F/4.
E)none of the above

Question

Quizplus · Accepted Answer

Doubling the charges of both particles quadruples the force (since force is proportional to the product of the charges), but doubling the distance between them reduces the force to a quarter of its original value (since force is inversely proportional to the square of the distance). These changes cancel each other out, resulting in the original force F.

Two Charged Particles Attract Each Other with a Force F