Dielectrics In Capacitors

A parallel-plate capacitor of area , plate separation and capacitance is filled with four dielectric materials having dielectric constants and as shown in the figure below. If a single dielectric material is to be used to have the same capacitance in this capacitor, then its dielectric constant is given by:

1.
2.
3.
4.

A parallel plate capacitor with cross-sectional area and separation has air between the plates. An insulating slab of the same area but the thickness of is inserted between the plates as shown in the figure, having a dielectric constant, The ratio of the new capacitance to its original capacitance will be:

1.		2.
3.		4.

The plates of a parallel plate capacitor are separated by Two slabs of different dielectric constant and with thickness and respectively are inserted in the capacitor. Due to this, the capacitance become two times larger than when there is nothing between the plates.
If the value of is:

1.		2.
3.		4.