What is Motional Electromotive Force??
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An emf induced by the motion of the conductor across the magnetic field is a motional electromotive force. The equation is given by E = -vLB. This equation is true as long as the velocity, field, and length are mutually perpendicular. The minus sign associated with the Lenz's law.
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If a rod of length l moves with velocity v in a direction perpendicular to a uniform and time independent magnetic field B, an emf is induced in the rod. The induced emf Blv is called motional emf as it is induced by moving a rod or conductor instead of varying the magnetic field
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