Wheeler's formula is the formula used to determine inductance for each inductor coil style.
Hence, the statement is a) true.
An electrical conductor's propensity to resist a change in the flow of current through it is known as inductance. A magnetic field is produced around a conductor by an electric current flowing through it. The amount of the current determines the field strength, which follows any variations in current.
For c>0.2r, Wheeler's spiral formula is 1% correct. Even though this is a "round wire" formula, it could still work, albeit with less precision, for printed circuit spiral inductors. Two formulae where p=q and pq are present provide the inductance in henries of a square printed circuit inductor.
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