Eddy currents are produced when

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(A) Eddy currents are induced currents produced in a bulk piece of a conductor when the magnetic flux linked with it changes. According to Faraday's l

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$A$ metal is kept in a varying magnetic field

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(A) Eddy currents are induced currents produced in a bulk piece of a conductor when the magnetic flux linked with it changes. According to Faraday's law of electromagnetic induction,a change in magnetic flux induces an electromotive force $(EMF)$. When a metal is placed in a varying magnetic field,the magnetic flux linked with the metal changes over time,which induces circulating currents within the bulk of the metal. These currents are known as eddy currents. Therefore,the correct condition is that the metal must be in a varying magnetic field.

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