Coulomb's law: A point charge Q is located a short distance from a point charge 3Q, and no other charges are present. If the electrical force on Q is F, what is the electrical force on 3Q?
A) F/3
B) F/
C) F
D) F
E) 3F

Question

Coulomb's law: A point charge Q is located a short distance from a point charge 3Q, and no other charges are present. If the electrical force on Q is F, what is the electrical force on 3Q?
A) F/3 
B) F/ 
C) F 
D) F 
E) 3F

Quizplus · Accepted Answer

According to Coulomb's law, the electrical force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. Since the distance between the two charges (Q and 3Q) is the same and there are no other charges present, the magnitude of the electrical force between them is the same. Therefore, the electrical force on 3Q is also F.

Coulomb's Law: a Point Charge Q Is Located a Short