What is this permittivity of free space or epsilon not

Dear Sunil

In electromagnetism, permittivity is the measure of how much resistance is encountered when forming an electric field in a medium. In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. Permittivity is determined by the ability of a material to polarize in response to the field, and thereby reduce the total electric field inside the material. Thus, permittivity relates to a material's ability to transmit (or "permit") an electric field.

its value is  8.85418782 × 10^-12 m^-3 kg^-1 s⁴ A²  

or 8.85… × 10⁻¹² F/m

All the best.

AKASH GOYAL

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