# a metal plate 8.0cm on a side carries a total charge 0.000012.determine the electrical field at 0.5cm above the surface of the plate near the plate's centre

Aman Bansal
592 Points
10 years ago

Dear Sammy,

Electrostatics is the branch of physics that deals with the phenomena and properties of stationary or slow-moving (without acceleration) electric charges.It is the branch of physics which deals with the study of charges at rest.

Since classical antiquity, has been known that some materials such as amber attract lightweight particles after rubbing. The Greekword for amber, ?λεκτρον electron, was the source of the word electricity. Electrostatic phenomena arise from the forces that electric charges exert on each other. Such forces are described by Coulombs law. Even though electrostatically induced forces seem to be rather weak, the electrostatic force between e.g. an electron and a proton, that together make up a hydrogen atom, is about 40 orders of magnitude stronger than the gravitational force acting between them.

Electrostatic phenomena include many examples, some as simple as the attraction of the plastic wrap to your hand after you remove it from a package, to the 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 quicklyneutralized[disambiguation needed] 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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Thanks

Aman Bansal