There is a reason behind i chose this topic for my blog and that is the word 'Permittivity'. It often confuse the students very much but if you read this blog till the end, i am sure that you will know the basic about what is Permittivity. 


What do you think when you heard the word 'Permittivity'? Permittivity means giving the permission to something. In electrostatics, we say that permission is given to flux to pass through some medium. It means that a medium with high permittivity, gives the permission to the flux to pass from it easily and the medium with low permitttivity does not let the flux pass easily.
For example you have a pipe and at one end the water is incoming and the other end the water is outgoing. If you block the outlet the water will not flow then it has low permittivity and vica versa.

Mathematically We represent the absolute permittivity with Îµ  and it is the ratio of lectric flux density  in an dielectric medium to the corresponding electric field strength and is expressed as Farad/meter.
i.e.   Îµ = D/E        F/m      

where D is the electric field density and E is the strength of the field.
It is also expressed in terms of relative permittivity with the space and expressed as

 Îµ =  Îµ0 *  Îµr 
   where Îµ0  is the permittivity of the space (8.854 * 10^-12 F/m)

Relative permittivity of the space is 1 while that of air is 1.0006. 

 Thank You for reading this article.