A charge Q is placed at the centre of the line joining two charges q and q. The system of three charges will be in equilibrium if Q is
The correct answer is:(d) -q/4.
For the system to be in equilibrium, the net force on each charge must be zero. When charge Q is placed at the center of two charges q and q, it must balance the forces acting between them. Using Coulomb’s law and solving for equilibrium conditions, we get Q = −q/4.
Class 12th Science Physics NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.
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For the system to be in equilibrium, the net force on each charge must be zero. By applying Coulomb’s law and balancing forces symmetrically, the required charge Q at the center must be -q/4 to counteract the repulsion between the two q charges. Answer: (d) -q/4.
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