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- Electromagnetic induction is not to be confused with "Magnetic induction", which usually refers to Magnetic field.
In practice, this means that an electrical current will be induced in any closed circuit when the magnetic flux through a surface bounded by the conductor changes. This applies whether the field itself changes in strength or the conductor is moved through it.
Faraday's law of electromagnetic induction states that:
For the common, but special case, of a coil of wire, comprised of N loops with the same area, Faraday's law of electromagnetic induction states that
- is the electromotive force (emf) in volts
- N is the number of turns of wire
- ΦB is the magnetic flux in webers through a single loop.
Further, Lenz's law gives the direction of the induced emf, thus:
- The emf induced in an electric circuit always acts in such a direction that the current it drives around the circuit opposes the change in magnetic flux which produces the emf.
Lenz's law is therefore responsible for the minus sign in the above equation.
The principles of electromagnetic induction are applied in many devices and systems, including:
- Induction motors
- Electrical generators
- Splashpower wireless chargers
- Contactless charging of rechargeable batteries
- Induction cookers
- Induction welding
- Electromagnetic forming
- Magnetic flow meters
- Transcranial magnetic stimulation
- Maxwell's equations for further mathematical treatment.
- Faraday's law of induction
- Eddy current
References & Bibliography
- David J. Griffiths (1998). Introduction to Electrodynamics (3rd ed.), Prentice Hall. ISBN 013805326X.
- Paul Tipler (2004). Physics for Scientists and Engineers: Electricity, Magnetism, Light, and Elementary Modern Physics (5th ed.), W. H. Freeman. ISBN 0716708108.
- J.S. Kovacs and P. Signell, Magnetic induction (2001), Project PHYSNET document MISN-0-145.
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