CalcTool: Solenoid properties calculator

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Solenoid properties

Inductance and magnetic B-field.

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The magnetic field strength for a solenoid is given by B=μI*n/l. The inductance of a solenoid is close to L=μr²n²π/l, but diverges increasingly from this estimation as the length becomes shorter relative to the radius.

Number of turns:
Length:
Radius:
Current:
Permeability:

Magnetic B-field:
Inductance:
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It is not necessary to enter a radius to determine the field strength, or a current to determine the inductance. Also note that the formula used for inductance is valid only when the coil length is significantly larger than the radius.
The permeability of a vacuum is defined as 4π*10^-7, or 0.0000012566 H/m. Non-ferrous materials have permeabilities very close to this value. Ferrous materials may have relative permeabilities quoted (available from the units menu for permeability), for example ~200 for iron.