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Faraday's Law

• Faraday’s law: When the magnetic flux through a loop changes with time, an electric current is induced in the loop. Faraday’s law states that the induced electromotive force (voltage) across the loop is minus the rate of change of flux.
• Lenz’s law: This law gives the direction of the induced current in the loop due to a changing magnetic flux. It states that the current direction is such as to oppose the change in flux. For example, if the flux is decreasing with time, the current direction will be so as to produce a magnetic field in the same direction as the external magnetic field.
• Faraday’s law provides the principle of operation of electrical generators; by rotating a coil in a uniform magnetic field (the coil being placed between the poles of a large magnet), a voltage (AC voltage) is induced across the coil.