37. Two charged objects repel each other with a 5 N force. If the charge on one

Question

37. Two charged objects repel each other with a 5 N force. If the charge on one of the objects was twice as large the force of repulsion would be (A) 2 times larger, (B)% as large; (C) 4 times larger, (D) 1/4 as large. 38. A positive charge and a negative charge are held some distance apart and then released. As they move, the force on each particle will (A) increase, (B) decrease; (C) stay the same. 39. An inventor brings an engine to you which operates between the temperatures of 2700 K and 300 K. Its theoretical efficiency is (A) 996, (B) 1106; (C) 24%; (D) 89%; (E) 99%

Explanation / Answer

(37) According to Coulomb's law, the electrostatic force is proportional to the product of charges. If one of the charges is twice as large, the force would be twice as large too. Hence, (A) is the correct answer.

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