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When designing & constructing Inductance standards, what considerations must be taken into account?
Ans: Construction of Inductors:
Constructional features of an inductor are determined largely by the frequency range in which it's to operate. Generally, low frequency inductors have many turns and employ an iron core. In contrast high-frequency inductors have fewer turns and frequently employ an air core. Stray capacitance between turns and between layers of turns is an important factor in high-frequency coils and hence special winding configurations may be employed to minimize this capacitance
Current and voltage considerations also conclude constructional features of an inductor. Gauge of the wire, for instance, is selected in accordance with the amount of current the coil should carry. Receiver coils, which normally carry only a few mille-amperes of current, are therefore wound from fine wire. Transmitter coils, though, often carry much greater currents and are wound using heavier wire. Spacing between turns, insulation of the wire, and insulation between layers of turns should be adequate to prevent voltage breakdown and arcing. An inductor designed for use in high-voltage circuits will, hence, have heavier insulation than one designed for low voltage applications. Inductors may be made of Powder core, Iron core, Ferrite core or Air core depending upon frequency range of their operation.
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