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IMPORTANT
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Assertion : Increasing the charge on the plates of a capacitor means increasing the capacitance.

Reason : Because Q=CVQC.

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Important Questions on Capacitance

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Assertion: The capacitance of a capacitor depends on the shape, size and geometrical placing of the conductors and its medium between them.

Reason: When a charge q passes through a battery of emf E from the negative terminal to an positive terminal, an amount qE of work is done by the battery.

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Assertion :- A dielectric slab is inserted between the plates of an isolated charged capacitor. The charge on the capacitor will remain the same.

Reason :- Charge on an isolated system is conserved.

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Assertion : If three capacitors of capacitance C1<C2<C3 are connected in parallel then their equivalent capacitance Cp>Cs

Reason : 1Cp=1C1+1C2+1C3

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Assertion: The capacitance of a capacitor remains the same even if the charge is varied on it.

Reason: Capacitance depends upon nearly medium as well as size and shape of capacitor.

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Assertion: A charged capacitor is disconnected from a battery. Now, if its plate are separated further, the potential energy will fall.
Reason: Energy stored in a capacitor is equal to the work done in charging it.
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Assertion : The force with which one plate of a parallel plate capacitor is attracted towards the other plate is equal to square of surface density per ε per unit area

Reason : The electric field due to one charged plate of the capacitor at the location of the other is equal to surface density per ε

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Two metallic spheres of radii 1cm and 3cm are given charges of -1×10-2C and 5×10-2Crespectively. If these are connected by a conducting wire, the final charge on the bigger sphere is:
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Three capacitors, each of capacitance $C$ and of breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination will be