Coil Inductance Calculator app for iPhone and iPad

Coil Inductance Calculator calculate the inductance of a coil of wire by input the number of turns, loop diameter, wire diameter, and the permeability of the medium.
Support for various of measurements unit for the loop diameter and wire diameter.

Equation
L-coil = inductance of the coil in henries (H)
N = number of wire turns
D = loop diameter
d = wire diameter
μ0 = permeability of free space = 4π×10−7
μr = relative permeability

An inductor, also called a coil, choke or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.
Basically, it uses a conductor that is wound into a coil, and when electricity flows into the coil from the left to the right, this will generate a magnetic field in the clockwise direction.

When the current flowing through an inductor changes, the time-varying magnetic field induces a voltage in the conductor, described by Faradays law of induction. According to Lenzs law, the direction of induced electromotive force (e.m.f.) opposes the change in current that created it. As a result, inductors oppose any changes in current through them.

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