AIPMT PRELIMS 2005 Physics Electric Potential Energy MCQ Question
Two charges q₁ and q₂ are placed 30 cm apart, as shown in the figure. A third charge q₃ is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is (q₃/4πε₀)k, where k is:
8q₂
8q₁
4q₂
4q₁
Correct Answer
Detailed Explanation
The potential energy change depends on the work done in moving the charge q₃ along the arc. The configuration suggests symmetry, and the potential energy change is proportional to q₁ due to the geometry.
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