試題詳解

9. The figure shows three electric charges labeled Q₁, Q₂, Q₃, and some
electric field lines in the region surrounding the charges. What are the
signs of the three charges?

(A) Q₁ is negative, Q₂ is positive, Q₃ is negative.
(B) Q₁ is positive, Q₂ is positive, Q₃ is negative.
(C) Q₁ is positive, Q₂ is negative, Q₃ is positive.
(D) Q₁ is positive, Q₂ is negative, Q₃ is negative.

(E) Q₁ is negative, Q₂ is negative, Q₃ is negative.