# Pls explain me permittivity

## Main Question or Discussion Point

Electrical permittivity...in mathematical terms, i.e I need the derivation...WITHOUT using 'curls'.

Didn't find it online.

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The permittivity of a medium is a constant that is connected to the electrical properties of that medium.Amongst other places it appears in Coulombs law and along with permittivity( a magnetic constant ) the formula for the speed of light.

The permittivity of a medium is a constant that is connected to the electrical properties of that medium.Amongst other places it appears in Coulombs law and along with permittivity**( a magnetic constant ) the formula for the speed of light.
In mks units, the capacitance of a rectangular capacitor of relative permittivity e, separation d, and area A is

C = e e0 A/d Farads

where e is relative permittivity (unitless)
e0 is the permittivity of free space, 8.85 x 10-12 Farads per meter.

**The magnetic constant is permeability.

In mks units, the capacitance of a rectangular capacitor of relative permittivity e, separation d, and area A is

C = e e0 A/d Farads

where e is relative permittivity (unitless)
e0 is the permittivity of free space, 8.85 x 10-12 Farads per meter.

**The magnetic constant is permeability.
Thank you Bob I got my mittivity mixed up with eability.I would blame it on the beer but I haven't had one yet.

I'm asking the derivation of permittivity, not relative.

And pls explain a bit of theory also.

Born2bwire