relative permittivity

[Bhuvanesh123]

what is the effect of relative permittivity in respect to current.air has low and water has high relative permitivity.how does it affect the electric field.

 

[eraste]

Hy,
Thirstly,the permittivity (eps)is introduce to connect E to D (Electric displacement) in the Maxwell Gauss equation. If you look at Capacitor, you can store more electric load if eps is high.
Secondly, eps appears in the Maxwell-Ampere equation with the displacement current : d/dt(D). And also, bring together with Maxwell -Faraday equation,we can determine the velocity of light which is : 1/sqrt(eps * mu). So velocity of light depend on eps and consequently wavelenght too.
Moreover, if the eps has a complex part, loss will appear in the propagation of the wave.

That's all for the moment but you can read some good books deal with this subject.

Bye.