A changing magnetic field can bring about an induced emf. Whenever a closed conducting path can be found, the induced emf brings about an induced current. A current produces a magnetic field, which can interact with the magnetic field that started this whole thing. The interaction is always to oppose the CHANGE that started this whole thing.
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For the same changing magnetic flux linkage, the amount of opposition (to the change) depends on the magnitude of the induced current, which depends on the resistance of the conducting path.
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xmPhysics 