GENERAL KNOWLEDGE

Detailed explanation-1: -A dielectric partially opposes a capacitor’s electric field but can increase capacitance and prevent the capacitor’s plates from touching.

Detailed explanation-2: -The mica sheet is a dielectric or insulator so it will increase the capacitance k times.

Detailed explanation-3: -Dry air is an excellent dielectric and is used in variable capacitors and some types of transmission lines. Nitrogen and helium are good dielectric gases. Distilled water is a fair dielectric.

Detailed explanation-4: -If you want to increase the Capacitance of Parallele Plate Capacitor then increase the surface area, reduce the separation between the plate and use a dielectric material in between the plate which have higher dielectric breakdown strength.

Detailed explanation-5: -(a) The molecules in the insulating material between the plates of a capacitor are polarized by the charged plates. This produces a layer of opposite charge on the surface of the dielectric that attracts more charge onto the plate, increasing its capacitance.