Atlearner-
April 19, 2023

April 11, 2022

The value of (*𝜀o*) is measured by the formula -

Where *c* is the *speed of light* that has a defined value of *299792458 m/s* and *μ0* is called the *magnetic constant* ( commonly known as *permeability of free space* ) that has an approximate value of *4π × 10-7 N/A**2*. So *εo* can be expressed numerically as

We all know from Coulomb's law that

We know that in the SI unit system the unit of charge is **Coulomb (C)**, the unit of force is **Newton (N)**, and the unit of distance is *meter (m)*.

Therefore, in the SI unit system, the unit of permittivity of free space (*𝜀o*) is

Similarly,

We know that when two charges are placed in a vacuum, then the effective force that is working between them is

And if the charges are placed in another medium instead of a vacuum, then the effective force that is working between them is

Now

Here this *𝜀r* is called *relative permittivity,* *𝜀* is called* absolute permittivity/permittivity of the medium*. and also *𝜀o* is the *permittivity of free space*.

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