Electrostatics
Electrostatics (also known as static electricity) is the branch of
physics that deals with the phenomena arising from what seem to be stationary electric charges. This includes phenomena as simple as the attraction of plastic wrap to your hand after you remove it from a package to apparently spontaneous explosion of grain silos, to damage of electronic components during manufacturing, to the operation of photocopiers. Electrostatics involves the buildup of charge on the surface of objects due to contact with other surfaces. Although charge exchange happens whenever any two surfaces contact and separate, the effects of charge exchange are usually only noticed when at least one of the surfaces has a high resistance to electrical flow. This is because the charges that transfer to or from the highly resistive surface are more or less trapped there for a long enough time for their effects to be observed. These charges then remain on the object until they either bleed off to ground or are quickly neutralized by a discharge: e.g., the familiar phenomenon of a static 'shock' is caused by the neutralization of charge built up in the body from contact with nonconductive surfaces.
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Électrostatique
Elektrostatik
Die Elektrostatik befasst sich mit ruhenden
elektrischen Ladungen, Ladungsverteilungen und den elektrischen Feldern geladener Körper.Schon im
Altertum war bekannt, dass bestimmte Materialien nach dem Reiben kleine leichte Teilchen, z. B. Papierschnipsel, anziehen (
Reibungselektrizität). Das griechische Wort „
elektron“ für
Bernstein, bei dem dieses Phänomen gut zu sehen ist, ist der Namensgeber für viele Bereiche der Naturwissenschaften.
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Elektrostatyka
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Elettrostatica
L'elettrostatica è un settore della
fisica che tratta delle
forze esercitate da un
campo elettrico stazionario (che non cambia nel tempo) su corpi carichi.L'esistenza di fenomeni elettrostatici era nota sin dall'antichità. Infatti gli antichi greci sapevano bene che strofinare un oggetto non metallico lo rendeva simile ad un
magnete: oggi sappiamo che i suoi elettroni vengono strappati dalla superficie o che altri elettroni vi vengono depositati. Nel primo caso si produce una elettrizzazione positiva, e nell'altro caso negativa.
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