MHT CET 2025 Physics question

Physics Electrostatic Potential and Capacitance MHT CET 2025

If the charge on the capacitor is increased by 3 C, the energy stored in it increases by 21%. The original charge on the capacitor is

(A)6 C
(B)3 C
(C)30 CCorrect
(D)90 C

Answer: (C)

Solution

Energy stored at fixed capacitance: . A 21% increase means , so and . Therefore , so C and $Q

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Question ID VK-101716