The induced emf cannot be produced by:

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(D) Faraday's law states that an induced $emf$ is produced whenever the magnetic flux linked with a circuit changes with time. $1$. Moving a magnet ne

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Maintaining large but constant current in a circuit

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(D) Faraday's law states that an induced $emf$ is produced whenever the magnetic flux linked with a circuit changes with time. $1$. Moving a magnet near a circuit changes the magnetic flux,thus inducing an $emf$. $2$. Moving a circuit near a magnet also changes the magnetic flux,thus inducing an $emf$. $3$. Changing the current in one circuit placed near another changes the magnetic field and thus the magnetic flux in the second circuit,inducing an $emf$. $4$. Maintaining a large but constant current in a circuit produces a constant magnetic field. Since the magnetic flux remains constant over time,no induced $emf$ is produced. Therefore,the correct answer is option $D$.

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