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** Faraday's law of induction
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Faraday's and law
* Of the four Maxwell's equations, two — Faraday's law and Ampère's law — can be compactly expressed using curl.
Faraday's law states that the curl of an electric field is equal to the opposite of the time rate of change of the magnetic field, while Ampère's law relates the curl of the magnetic field to the current and rate of change of the electric field.
This is the most used form for generating electricity and is based on Faraday's law.
Further analysis of this process, known as electromagnetic induction, enabled him to state the principle, now known as Faraday's law of induction, that the potential difference induced in a closed circuit is proportional to the rate of change of magnetic flux through the loop.
Below is a simplified equation of Faraday's first law:
: ( Faraday's law )
When the current flowing through an inductor changes, creating a time-varying magnetic field inside the coil, a voltage is induced, according to Faraday's law of electromagnetic induction, which by Lenz's law opposes the change in current that created it.
A change in this current creates a corresponding change in magnetic flux which, in turn, by Faraday's law generates an electromotive force ( EMF ) in the conductor that opposes this change in current.
Variations on this basic formula describe the magnetic force on a current-carrying wire ( sometimes called Laplace force ), the electromotive force in a wire loop moving through a magnetic field ( an aspect of Faraday's law of induction ), and the force on a particle which might be traveling near the speed of light ( relativistic form of the Lorentz force ).
* Faraday's law: Tankersley and Mosca
) The other two equations describe how the fields ' circulate ' around their respective sources ; the magnetic field ' circulates ' around electric currents and time varying electric field in Ampère's law with Maxwell's correction, while the electric field ' circulates ' around time varying magnetic fields in Faraday's law.
Faraday's law describes how a time varying magnetic field creates (" induces ") an electric field.
( Note: there are two closely related equations which are called Faraday's law.
If they did exist, both Gauss's law for magnetism and Faraday's law would need to be modified, and the resulting four equations would be fully symmetric under the interchange of electric and magnetic fields ; see magnetic monopoles for details.
* Faraday's law of induction
File: Faraday. png | Michael Faraday ( 1791-1867 ): showed how a changing magnetic field can be used to generate an electric current ( Faraday's law of induction ), applied this knowledge to the development of several electrical machines, described principles of electrolysis, early pioneer in the field of low temperature study
Persistent electric current flows on the surface of the superconductor, acting to exclude the magnetic field of the magnet ( Faraday's law of induction ).
The relationship between electromotive force ( EMF ) or " voltage " and magnetic flux was formalized in an equation now referred to as " Faraday's law of induction ":
The voltage induced across the secondary coil may be calculated from Faraday's law of induction, which states that:
2.363 seconds.