Béda révisi "Éléktromagnétisme"

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His findings resulted in intensive research throughout the scientific community in [[electrodynamics]]. They influenced French physicist [[André-Marie Ampère]]'s developments of a single mathematical form to represent the magnetic forces between current-carrying conductors. Ørsted's discovery also represented a major step toward a unified concept of energy.
 
Ørsted was not the first person to examine the relation between electricity and magnetism. In 1802 [[Gian Domenico Romagnosi]], an Italian legal scholar, deflected a magnetic needle by electrostatic charges. He interpreted his observations as ''The Relation'' between electricity and magnetism. Actually, no galvanic current existed in the setup and hence no electromagnetism was present. An account of the discovery was published in 1802 in an Italian newspaper, but it was largely overlooked by the contemporary scientific community.
 
A changing magnetic field produces an electric field (this is the phenomenon of [[electromagnetic induction]], the basis of operation for [[electrical generator]]s, [[induction motor]]s, and [[transformer]]s). Similarly, a changing electric field generates a magnetic field. Because of this interdependence of the electric and magnetic fields, it makes sense to consider them as a single coherent entity—the electromagnetic field.
 
== The electromagnetic force ==
{{mainutama|Electromagnetic force}}
The force that the electromagnetic field exerts on electrically charged particles, called the '''electromagnetic force''', is one of the four [[fundamental force]]s. The other fundamental forces are the [[strong interaction|strong nuclear force]] (which holds [[atomic nucleus|atomic nuclei]] together), the [[weak interaction|weak nuclear force]] (which causes certain forms of [[radioactive decay]]), and the [[gravity|gravitational force]]. All other forces are ultimately derived from these fundamental forces.
 
* [[ohm]] (resistance)
* [[volt]] (electric potential)
* [[watt]] (power)
 
In the electromagnetic cgs system, electrical current is a fundamental quantity defined via [[Ampère's law]] and takes the [[Permeability (electromagnetism)|permeability]] as a dimensionless quantity (relative permeability) whose value in a vacuum is unity. As a consequence, the square of the speed of light appears explicitly in some of the equations interrelating quantities in this system.
 
== External links ==
 
* [http://www.emtalk.com Electromagnetic Tutorials and Forums] EM Talk
* [http://ocw.mit.edu/OcwWeb/Physics/8-02Electricity-and-MagnetismSpring2002/VideoLectures/index.htm MIT Video Lectures - Electricity and Magnetism] from Spring 2002. Taught by Professor Walter Lewin.
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