Capacitance of parallel plate Capacitor & Dielectric Constant & Dielectric Strength of Capacitor

Hello all here is another post about the Capacitor

Capacitor

Capacitance of a parallel plate Capacitor :

Parallel plate Capacitor
1) air as Dielectric 2) some other Dielectric medium

The figure shows a parallel plate air capacitor is given by 


Cair = ε0 A/d


Where  A is the area of each plate
          d is the plate separation


It is clear that capacitance of a parallel plate Capacitor is directly proportional to the area of plates and inversily proportional to plate separation

When space between plates completely filled with Dielectric the capacitance of capacitor is given by

Cm = εA/d
     = ε0εrA/d
     =εr Cair

Dielectric Constant of capacitor :

Capacitance of a parallel plate air Capacitor is Given by

Cair = ε0A/d


If the space between the plates completely filled with a Dielectric of relative Permittivity "εr" then the capacitance of capacitor is given by

Cm = εr Cair

Cm/Cair = εr


Dielectric Strength :

The maximum value of Electric field Intensity ( i.e potential gradient ) that can be applied to a Dielectric without it's Electric breakdown is called Dielectric strength of the Dielectric .

Related Topics :

Capacitor And Capacitance 

Electric field Intensity


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