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Energy stored when the charge on a capacitor changes

This type of question, asked 3 times: 12 May 2024 S2, 21 Apr 2025 S2, 18 Apr 2026 S1. All 3 questions below, oldest first.

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  1. Question 1

    12 May 2024 S2

    49
    If the charge on the capacitor is increased by 3 coulomb, the energy stored in it increases by 44%. The original charge on the capacitor is

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  2. Question 2

    21 Apr 2025 S2

    26
    If the charge on the capacitor is increased by 3C, the energy stored in it increases by 21%21\%. The original charge on the capacitor is

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  3. Question 3

    18 Apr 2026 S1

    129
    A capacitor of capacitance C has charge Q and energy stored in it is W. If the charge is increased to 3Q, the energy stored in the capacitor W' will be

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