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A transformer could be produced by inserting the windings near each other, an arrangement termed an "air-core" transformer. An air-core transformer eliminates loss because of hysteresis within the core material.[12] The magnetizing inductance is drastically lowered by the dearth of a magnetic core, resulting in large magnetizing currents and losses if used at low frequencies. Air-core transformers are unsuitable to be used in energy distribution,[12] however are regularly employed in radio-frequency purposes.[37] Air cores are additionally used for resonant transfo