Electrostatics

chargingA2.gif (6446 bytes)


Take a look at the Physics Tutoring: Electrostatic Pendulum Lab


Previously Asked Questions

Q:     Are all charged objects subject to Coulomb's law?

A:    Yes.  The French physicist Coulomb derived (from experiments) a formula for the force F applied by an electric field E to a charge q.  All charges placed in electric fields are subjected to forces.  The Coulomb formula for the force applied by an electric field to a charge is: F = E . q

Q:     When wearing rubber soled shoes and scuffing them on a carpet it is possible to build up a charge and shock people by touching them.  Please explain how the charge is built up and then dissipated.

A:    Person A, the one with the rubber shoes, becomes charged by walking on the carpet as a result of repeated contact and separation between the soles of his shoes and the carpet.  If   another person B now touches him, the charge accumulated on A will be transferred to B and both of them will feel the shock of charge transfer.

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References

Definitions

Conductors:  a material or object that permits an electric current to flow easily.

Insulators:  a material that is a poor conductor (does not permit an easy flow of electric current)

Facts

The SI Unit for charge is the coulomb (C.)  It is defined in terms of the unit of current ampere (A) as the charge passing through a particular point in 1 second when there is a current of 1 ampere in that point.

Equations

Coulomb's Law 22-4.gif (319 bytes)
Permitivity Constant epsilon2.gif (824 bytes) 0 = 8.85418781762 x 10-12    C2/(N m2)

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List of Topics

Measurements Electric Potential Magnetism Electrical Circuits (AC) Optical Instruments: Mirrors and Lenses
Electrostatics Capacitance Sources of Magnetic Fields Maxwell's Equations Interference
Electric Fields Current and Resistance Magnetism in Matter Electromagnetic Waves Diffraction
Electric Flux Electrical Circuits (DC) Electromagnetic Induction Interaction of Radiation with Matter: Reflection, Refraction, Polarization  

 

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