Friday, June 18

ELECTROSTATICS II

ELECTROSTATICS II

Topics covered in this Video include:

Review of Electrostatics I
Examples on combination of capacitors
Examples on combination of capacitors
Energy stored in a charged capacitor
Aplications of capacitors
Electric field patterns
Charge distribution on conductors
Charges on sharp points
Capacitors
Charging and discharging capacitors
Capacitance
Combination of capacitors capacitors in series
Combination of capacitors-capacitors in series
Combination of capacitors capacitors in parallel
Combination of capacitors-capacitors in parallel

Electrostatics is a branch of physics that studies electric charges at rest.

Since classical physics, it has been known that some materials such as amber attract lightweight particles after rubbing. The Greek word for amber,or 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 Coulomb’s law. Even though electrostatically induced forces seem to be rather weak, some electrostatic forces such as the one between an electron and a proton, that together make up a hydrogen atom, is about 36 orders of magnitude stronger than the gravitational force acting between them.

There are many examples of electrostatic phenomena, from those as simple as the attraction of the plastic wrap to one’s hand after it is removed from a package to the apparently spontaneous explosion of grain silos, the damage of electronic components during manufacturing, and photocopier & laser printer operation. 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 are trapped there for a time long enough 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 insulated surfaces.