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If the voltage across a capacitor is increased from $V$ to $2V$, then
Acapacitance doubles, charge unchanged
Bboth charge and capacitance double
Ccharge doubles, capacitance unchanged
Dboth remain unchanged
Answer & Solution
Correct answer: C. charge doubles, capacitance unchanged
1. Capacitance depends only on geometry and the dielectric, not on the voltage: $C$ stays the same.
2. Since $Q = CV$ and $C$ is fixed, doubling $V$ **doubles $Q$**.
3. So charge doubles while capacitance is unchanged.
_Source: Samacheer Kalvi Class 12 Physics Vol.1, Unit 1 'Electrostatics', Evaluation Q.12_
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