Eddy currents are induced when:

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(A) Eddy currents are induced in a conductor whenever the magnetic flux linked with the conductor changes.This change in magnetic flux can occur if a

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$A$ metal block is kept in a changing magnetic field

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(A) Eddy currents are induced in a conductor whenever the magnetic flux linked with the conductor changes.This change in magnetic flux can occur if a metal block is placed in a time-varying magnetic field or if a metal block moves through a non-uniform magnetic field.Therefore,when a metal block is kept in a changing magnetic field,the magnetic flux through it changes,inducing eddy currents according to Faraday's law of induction.Thus,option $A$ is correct.

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