The electric field at point A is zero. What is charge Q₁?

Question

Quizplus · Accepted Answer

According to the question, the electric field at point A is zero. This means that the electric field due to Q₁ and QTB7291_00 at point A must be equal and opposite in direction. Since the distance between Q₁ and A is smaller than that between QTB7291_00 and A, the magnitude of the charge at Q₁ must be larger than that at QTB7291_00. Thus, the only option where Q₁ has a larger charge magnitude than QTB7291_00 is option A (+32 μC). Therefore, the answer is (A).

The Electric Field at Point a Is Zero