There are $10$ condensers each of capacity $5μF$. The ratio of minimum to maximum capacity obtained from these condensers will be :

When air is replaced by a dielectric medium of constant $K$, the capacity of the condenser:

Three equal condensers of capacity $C$ each are connected to form a triangle as shown above. The effective capacity across any side is :

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is:

The equivalent capacitance between P and Q of the given figure is (the capacitance of each capacitor is$1μF$ ):

A parallel plate capacitor is first charged and then isolated , and a dielectric slab is introduced between the plates. The quantity that remains unchanged is: