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Eddy currents are produced when

1. a metal is kept in varying magnetic field
2. a metal is kept in steady magnetic field
3. a circular coil is placed in a magnetic field
4. through a circular coil, current is passed

Correct answer: a metal is kept in varying magnetic field

Solution

Eddy currents are induced in a conductor when it is exposed to a changing magnetic field, as per Faraday's law of electromagnetic induction. This occurs due to the relative motion between the conductor and the magnetic field or due to a time-varying magnetic field.

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