Air Core Coil – not a magnetic core

• Coil Diameter (d)

   inches

• Coil Length(l)

   inches

• Number of turns (n)

   turns

•  

   

• Inductance

    µH

Formula:

F = (n x i)² x magnetic constant x a / (2 x g²)

Where,
F = Force, i = Current, g = Length of the gap between the solenoid and a piece of metal, a = Area n = Number of turns, Magnetic constant = 4 x PI x 10-⁷.

When a inductor does not use a magnetic core, air core coil have low inductance nut used at high frequencies and they are free from energy losses. This electrical energy calculator is a great tool to calculate air core coil inductance.