Question

what is permittivity of free space??​

Answer 1

The permittivity of free space, ε0, is a physical constant used often in electromagnetism. It represents the capability of a vacuum to permit electric fields. It is also connected to the energy stored within an electric field and capacitance.

Answer 2

Vacuum permittivity, commonly denoted ε₀ is the value of the absolute dielectric permittivity of classical vacuum. Alternatively it may be referred to as the permittivity of free space, the electric constant, or the distributed capacitance of the vacuum. It is an ideal physical constant.