Question

Epsailon not value salution

Answer 1

why you have asked one question three times??

Answer 2

The physical constant ε0 (pronounced as "epsilon naught"), commonly called the vacuum permittivity, permittivity of free space or electric constant, is an ideal, (baseline) physical constant, which is the value of the absolute dielectric permittivity of classical vacuum. It has an exactly defined value

ε0 = 8.854187817...×10−12 F⋅m−1 (farads per metre).[1]

It is the capability of the vacuum to permit electric field lines. This constant relates the units for electric charge to mechanical quantities such as length and force.[2] For example, the force between two separated electric charges (in the vacuum of classical electromagnetism) is given by Coulomb's law:

{\displaystyle \ F_{\text{C}}={\frac {1}{4\pi \varepsilon _{0}}}{\frac {q_{1}q_{2}}{r^{2}}}}