# AP Physics 1 Question 164: Answer and Explanation

### Test Information

Question: 164

4.

Question below refer to the following information:

Two metal balls of equal mass (100 g) are separated by a distance (d). In state 1, shown in the figure, the left ball has a charge of +20 µC, while the right ball has a charge of –20 µC. In state 2, both balls have an identical charge of –40 µC.

Which of the following statements about the magnitudes of the electrostatic and gravitational forces between the two balls is correct?

• A. The electrostatic force is greater in state 2 than in state 1. The electrostatic force is greater than the gravitational force in state 1, but the gravitational force is greater than the electrostatic force in state 2.
• B. The electrostatic force is greater in state 1 than in state 2. The electrostatic force is greater than the gravitational force in state 1, but the gravitational force is greater than the electrostatic force in state 2.
• C. The electrostatic force is greater in state 2 than in state 1. The electrostatic force is greater than the gravitational force in both states.
• D. The electrostatic force is greater in state 1 than in state 2. The electrostatic force is greater than the gravitational force in both states.