Answer
The correct answer is:
(d) none of the above
Work Step by Step
Gravitational forces are always attractive forces, while electric forces may repel or attract depending on the charges. Therefore, statement (a) is incorrect.
The electric force and the gravitational force both follow the inverse square law, so they are inversely proportional to the square of the separation distance. Therefore, statement (b) is incorrect.
The gravitational forces between planets (and stars) are much stronger than the electric forces between planets, and that is why gravitational forces govern planetary motion. Therefore, statement (c) is incorrect.
The correct answer is:
(d) none of the above
