Question

Consider the following materials:

(i) Quartz

(ii) Ammonium dihydrogen phosphate
(iii) Lithium sulfate

Arrange the above materials in decreasing order of their dielectric constant. 

1. (i), (ii), (iii)
2. (ii), (iii), (i)
3. (iii), (ii), (i)
4. (i), (iii), (ii)

Answer 1

Correct Answer - Option 2 : (ii), (iii), (i)

The dielectric constant (k) of a material is the ratio of its permittivity ε to the permittivity of vacuum εo , so k = ε / εo.

The dielectric constant is therefore also known as the relative permittivity of the material.

Since the dielectric constant is just a ratio of two similar quantities, it is dimensionless

Material	Dielectric constant
Quartz	3.76
Ammonium dihydrogen phosphate	7.43
Lithium sulfate	5.81
Carbon	2.5-3.0
Silicon carbide	10
Silicon nitride	9.5
Gallium nitride	11.2

Hence, option 2 is correct.