Faraday’s law of electromagnetic induction says: For any circuit, the induced electromotive force (EMF) is equal to the rate of change of the magnetic flux passing through this circuit, taken with a minus sign. In other words, the generated EMF is proportional to the rate of change of the magnetic flux. In this case, the induction current is directed in such a way that its action is opposite to the action of the cause that caused this current.
But the current is only when the circuit is closed.
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