Electrostatics Multiple Choice Questions and Answers

11. Two positive charges with magnitudes 4Q and Q are separated by a distance r. Which of the following statements is true?

1. The charge with a greater magnitude exerts a larger force on the small charge
2. The charge with a greater magnitude exerts a smaller force on the small charge
3. The forces on each charge are the same in magnitude and opposite in direction
4. The forces on each charge are the same in magnitude and pointing in the same direction

12. Sphere A is charged positively and sphere B is neutral. The spheres are brought near each other. Which of the following statements is true?

1. There is no electrostatic force between the spheres since one is neutral
2. There is a repulsive electrostatic force between the spheres
3. There is an attractive electrostatic force between the spheres
4. There is a repulsive electrostatic force applied only on sphere B

13. Two positive charges Q1 and Q2 are separated by a distance r. The charges repel each other with a force F. If the magnitude of each charge is doubled and the distance stays unchanged what is the new force between the charges?

1. F
2. 2F
3. 4F
4. 1/4 F

14. Two positive charges Q1 and Q2 are separated by a distance r. The charges repel each other with a force F. If the distance between the charges is cut to one-fourth what is the new force acting on each charge?

1. 16F
2. 4F
3. 2F
4. 8F