SAT Subject Physics Practice Question 330: Answer and Explanation
26. Two charged spheres are separated by 2 mm. Which of the following would yield the greatest attractive force?
A. +1q and +4q
B. –1q and –4q
C. +2q and +2q
D. –2q and –2q
E. +2q and –2q
Correct Answer: E
The correct answer is (E). The only pair of charged bodies that would attract one another is the pair of unlike charged spheres.The rest of the pairs are like charges, which repel one another.