Capacitance MCQ Level - 2 - Physics MCQ

In the figure a capacitor of capacitance 2µF is connected to a cell of emf 20volt. The plates of the capacitor are drawn apart slowly to double the distance between them. The work done by the external agent on the plates is :

In the figure shown the plates of a parallel plate capacitor have unequal charges. Its capacitance is C. P is a point outside the capacitor and close to the plate of charge –Q. The distance between the plates is d select incorrect alternative :

The plates S and T of an uncharged parallel plate capacitor are connected across a battery. The battery is then disconnected and the charged plates are now connected in a system as shown in the figure. The system shown is in equilibrium. All the strings and springs are insulating and massless. The magnitude of charge on one of the capacitor plate is :
(Area of plate = A)

The key K (figure) is connected in turn to each of the contacts over short identical time intervals so that the change in the charge on the capacitor over each connection is small. The final charge q_r on the capacitor is :

A parallel plate capacitor of capacitance C (without dielectrics) is filled by dielectric slabs as shown in the figure. Then the new capacitance of the capacitor is :

Initially switch S is connected to position 1 for a long time. The net amount of heat generated in the circuit after it is shifted to position 2 is

The equivalent capacitance between x and y is :