NEETPhysics-Electrostatics
NEET Physics Potential Energy MCQ Question
Type: MCQ-numerical-Hard-Class 12
Three charges Q, +q and -q are placed at the vertices of an equilateral triangle of side l as shown in the figure. If the net electrostatic energy of the system is zero, then Q is equal to
A
-q/2
B
-q
C
+q
D
Zero
Correct Answer
Option A
Detailed Explanation
The net electrostatic energy is zero when the potential energy contributions from all pairs of charges cancel out. Solving gives Q = -q/2.
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