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  2 Parallel Plates Coaxial Cylinders

 

The formulas on this page allow one to calculate the capacitance for certain given geometries.  More complex problems typically require one to model the geometry and solve using Finite Element Analysis.

 

2 Parallel Plane Plates
 
 

Diagram of a parallel plate capacitance

Equation for parallel plate capacitance

e is the permittivity (F/m) 

e0 is the permittivity of free space (F/m) 

er is the relative permittivity of the dielectric 

A is the area of the electrodes (length, l * width, w in m2) 

d is the distance between the plates (m)

 

2 Coaxial Cylinders
 
 

Diagram for a coaxial cylinder capacitance

Equation for a coaxial cylinder capacitance

e is the permittivity (F/m) 

e0 is the permittivity of free space (F/m) 

er is the relative permittivity of the dielectric 

a is the radius of the inner cylinder 

b is the radius of the outer cylinder 

l is the length of the cylinders (m)

 

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