In couloumb's law the value of the constant k is 1/4pi epsilon naught.Here epsilon naught is the vaccum permittivity.But what actually is permittivity here??

Dear student

 

The force of attraction between two charges q₁ and q_{2 placed at a distance r is given by ;}

 

F = ( 1 / 4 ∏ ε ) ( q_{1 x q}2 _{/ r² )}

 

here, ε is the permeability of the medium. The permittivity of free space , ε_{o is 8.854 x 10^-12  farad / meter.}

 

we hope this clarifies your doubt.

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