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of the magnetic flux through the surface of a wire loop can be achieved in several ways:
# the magnetic field B changes (e.g. an alternating magnetic field, or moving a wire loop towards a bar magnet where the B field is stronger),
# the wire loop is deformed and the surface ? changes,
# the orientation of the surface dA' changes (e.g. spinning a wire loop into a fixed magnetic field),
# any combination of the above

Maxwell-Faraday equation

In general, the relation between the emf in

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