SAT Subject Physics Practice Question 432: Answer and Explanation
8. Which of the following best describes the electric field about a positive point charge?
A. The field strengthens as the distance from the point charge increases.
B. The field is a constant throughout space.
C. The field weakens as the distance from the point change increases.
D. The field is oriented toward the point charge.
E. The field cannot be determined.
Correct Answer: C
The correct answer is (C). The value of the electric field about a point source is E =kq/r2 . The distance from the point in question determines the strength of the electric field in this case.