What do you mean by Lenz law

What do you mean by Lenz law? Describe in brief.

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The induced current is always in such a direction as to resist the motion or change causing it whenever there is an induced electromotive force (that is, emf) in a conductor, it is always in such a direction that the current it would generate would resist the change which causes the induced emf. When the change is the motion of a conductor via a magnetic field, then the induced current should be in such a direction as to produce a force opposing the motion. If the change causing the emf is a change of flux threading the coil, the induced current should generate a flux in such a direction as to resist the change.

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