AIIMS 2018 Physics Capacitance MCQ Question

The voltage at point B is calculated using charge conservation, leading to the equation $5(V - 10) + 2(V - 0) + 1(V - 10) = 0$. Solving this gives $V = 7.5 \, \text{V}$, confirming that option A is correct. The other options (15 V, 30 V, and 45 V) do not satisfy the charge conservation equation, indicating that they do not represent the correct potential difference at point B in the circuit. Understanding charge conservation is crucial in analyzing circuits, as it ensures that the total charge remains constant throughout the system.