Copper's Surprising Reaction to Strong Magnets

Faraday’s Experiment – Conclusions

 —An electric current can be induced in a loop by a changing magnetic field

—This would be the current in the secondary circuit of this experimental set-up

—The induced current exists only while the magnetic field through the loop is changing Faraday’s law of induction states that “the emf induced in a circuit is directly proportional to the time rate of change of the magnetic flux through the circuit

—Lenz’s law: 
The induced current tends to keep the original magnetic flux through the circuit from changing

the induced current in a loop is in the direction that creates a magnetic field that opposes the change in magnetic flux through the area enclosed by the loop

In this video : Lenz's Law And Faraday's Law of Induction to generate electricity and magnetic force fields in copper.