state the underlying principle of a transformer.
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https://www.meritnation.com/ask-answer/question/its-principle-of-working-why-efficiency-of-a-transform/electrostatic-potential-and-capacitance/6249947
https://www.meritnation.com/ask-answer/question/its-principle-of-working-why-efficiency-of-a-transform/electrostatic-potential-and-capacitance/6249947