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I did an experiment where I varied the test voltage and determine the values of the resistance and magnetising reactance of the core. What I noticed is that their values actually vary (not constant). Ideally speaking, shouldn't their values be constant regardless of the test voltage (while they vary in practice)?

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The magnetizing reactance decreases as the iron becomes saturated with increased voltage. The resistance increases as the current increase causes the winding temperature to increase.

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