If relative permittivity for any substance is $80$ then its electric susceptibility is _____

What is a capacitor? You know that the capacity of a parallel plate condenser is $C=\frac{{\epsilon }_0 A}{d}$. What will be its new capacitance $C\text{'}$ of the capacitor if a material of dielectric $K$ is inserted between the plates? Calculate the capacitance of the capacitor shown below.

Explain the behaviour of dielectrics in an external field.

The capacity of a parallel plate capacitor with air is $18 \mathrm{pF}$ When a dielectric material is inserted in the space between the plates, its capacity becomes $108 \mathrm{pF}$.Calculate the permittivity of the material. What is the material?(${\mathrm{\epsilon }}_0=8.854\times {10}^{-12}{\mathrm{C}}^2{\mathrm{N}}^{-1}{\mathrm{m}}^{-2}$)

Can a metal be used as a medium for dielectric?

If polarization is $\left(\stackrel{\wedge }{\mathrm{i}}+5\stackrel{\wedge }{\mathrm{j}}+2\stackrel{\wedge }{\mathrm{k}}\right)$ unit and E_x = 10 unit then find magnitude electric field.

Assertion: The dipoles in a dielectric are not completely aligned in a weak external electric field.

Reason: Thermal energy tends to de-align them.

The lower half region of parallel plate capacitor is filled by a dielectric slab as shown in figure. Taking plate area as $A$ then incorrect statement is :-