Question

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??

Answer 1

Absolute permittivity of free space.
K = 9*10(9) Nm2C(-2)

Answer 2

Permittivity refers to the capability of the vacuum to the permeate electrical field. This constant describes the units for electric charge to mechanical measures like length and force.

• For example, using Coulomb's law, the force between two separated electric charges (in the vacuum of classical electromagnetism) can be written :

• The force of attraction between two charges q₁ and q₂ placed at a distance r is given by $F =\frac{q1 q2}{4\pi E r^{2} }$

here, ε is the permeability of the medium. The permittivity of free space ,

ε₀ is $8.854 *10^{-12} \frac{Farad}{meter}$