Although magnetostatic potential exists, no useful energy could be derived from it. However, when variability is induced the result is an electromotive force (emf). This was discovered by Faraday in 1831 and also by Lenz in 1834. Now, these discoveries are widely known as Faraday’s laws of electromagnetic induction and Lenz’s law. Lenz’s principle says that the direction of the induced emf always opposes the magnetic force field that produces it. Although nature abhors the vacuum the emf reacts to its inductivity for useful energy expenditures. Equivalently, Lenz’s principle is also one of energy conservation.


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