Capacitor and Capacitance

Physics

definition

Electrical capacitance of a conductor

Capacitance is the constant of proportionality relating charge to the potential difference between the conductors in a capacitor. 


where is the capacitance, is the charge contained and is the potential difference. 
The SI Unit of capacitance is or Common unit is Farad.

formula

Capacitance of parallel plate capacitor

We know that
But and
putting these values in capacitance formula we get 
  
Where, A = Area of plate, d = Distance between capacitor plates
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