alleryStart learning →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_
Keep practising Electromagnetism
Browse all Electromagnetism questions for Tamil Nadu HSC (Class 12), or explore more Physics topics.
Related questions
On the axial line of a short dipole the electric field is $E_a$, and on the equatorial linThe energy stored in a capacitor of capacitance $C$ charged to voltage $V$ (holding chargeBy Gauss's law, the total electric flux through a closed surface enclosing a net charge $QA parallel-plate capacitor has capacitance $C$. If BOTH the plate area and the plate separAn equipotential surface is one on whichThe relation between the electric field and the electrostatic potential isPoints A and B are at potentials $+7\ V$ and $-4\ V$. The work done in moving 50 electronsTwo objects rubbed together acquire a charge of $50\ nC$ each. The number of electrons tra