AP Physics 1 Question 59: Answer and Explanation
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9. Two objects have a mass 1 kg and carry a charge of magnitude 1 C each. Which statement correctly identifies the relationship between the magnitude of the force of gravity, Fg, and the magnitude of the electric force, FE, between the objects?
- A. Fg > FE
- B. Fg < FE
- C. Fg = FE
- D. Cannot be determined without knowing the sign of the charges.
Correct Answer: B
B In this situation, all variables will have the same numerical values for both forces. Therefore, it comes down to the constants. Because Coulomb's constant (9.0 × 109) is much, much greater than the gravitational constant (6.7 × 10-11), electric force will be greater. Because the question specifies magnitude, the signs of the charges are irrelevant.