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Battery voltage of a capacitor whose charge falls from Q to Q1 when the voltage drops by V1

The same question, asked 2 times: 26 Apr 2025 S2, 12 May 2026 S2. Every wording below, oldest first.

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  1. Question 1

    26 Apr 2025 S2

    3
    A capacitor of unknown capacity is connected across a battery of V volt. The charge stored in it is Q coulomb. When potential across the capacitor is reduced by V1V_{1} volt, the charge stored in it becomes Q1Q_{1} coulomb. The potential VV is

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  2. Question 2

    12 May 2026 S2

    128
    A capacitor of unknown capacitance is connected across a battery of ′V′'V' volt. The charge stored in it is ′Q′'Q' C. When potential across the capacitor is reduced by ′V1′'V_1' volt, the charge stored in it becomes ′Q1′'Q_1' C. The potential ′V′'V' is

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