Question

Define the dielectric constant of a medium. What is its SI unit?

Answer 1

1. The dielectric constant of a material is defined as the ratio of the permittivity of the material to the permittivity of free space.
2. It is denoted by K.

$K=\frac{\epsilon }{{\epsilon }_0}$ Where $\epsilon$is the electric permittivity of the medium and ${\epsilon }_0=8.854\times {10}^{-12}{C}^2{N}^{-1}{m}^{-2}$ is the electrical permittivity of the free space

3. The dielectric constant of a few substances is given below

$$\begin{gathered} vacuum=1 \\ air=1.0006 \\ water=81 \\ paper=3.6 \end{gathered}$$

4. Some of The factors affecting the dielectric constant of material are frequency, applied voltage, temperature, moisture, humidity, etc.