Calculation of capacitance of concentric cylinders using the formula [ C = 2 x Pi x ε_{o} x ε_{r} / Log( D/d ) ] where:
D is the Inside Diameter of the Outer tube in mm,
d is the Outside Diameter of the Inner tube in mm. ε_{r} is the permittivity or dielectric constant (k) between the tubes.(Air = 1)
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