Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be
A) F.
B) 2 F.
C) F/4.
D) F/2.
E) none of these

Question

Quizplus · Accepted Answer

The force between two charges is given by Coulomb's law: F = k * (q1 * q2) / r^2. If one charge is doubled (2q1) and the distance is doubled (2r), the new force F' = k * (2q1 * q2) / (2r)^2 = (1/2) * F.

Two Charged Particles Repel Each Other with a Force F