What is Electromagnetic Induction
When a conductor, such as a loop of wire or a coil, moves through a magnetic field, the magnetic flux passing through it changes with time. Since the cross-sectional area of the loop is fixed, the change in flux is caused by the changing magnetic field. This changing magnetic field applies force to the free electrons in the conductor. As a result, these electrons move and produce a current inside the conductor. This current is known as induced current.The potential difference between any two points in the conductor is known as induced emf (electromotive force). The process of generating an electric current by a changing magnetic field is called electromagnetic induction.
The magnetic field comes from a permanent magnet like a bar magnet. The phenomenon is called induction because there is no physical contact between the conductor and the magnet. The magnetic lines of force pass through air or medium if the coil is wrapped around a metallic core. A condition of electromagnetic induction is that there should be a relative motion between the conductor and the magnet.
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