Electromagnetic Induction and Faraday’s Law.

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Presentation transcript:

Electromagnetic Induction and Faraday’s Law.

Induced EMF

Induced EMF is produced by a changing of magnetic field.

Induced EMF is proportional to the rate of change of the magnetic flux, FB

Units of Magnetic Flux 1 weber (1 Wb) = 1 T m2

Faraday’s Law of Induction If the flux through N loops of wire changes by the amount of DFB during time Dt, the average induced emf during this time is:

Lenz’s Law An induced emf always creates a current whose magnetic field opposes the original change in flux.

Different Examples