chapter23

chapter23 - Chapter 23 Electric Fields Electricity and...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 23 Electric Fields Electricity and Magnetism, Some History Many applications Macroscopic and microscopic Chinese Documents suggest that magnetism was observed as early as 2000 BC Greeks Electrical and magnetic phenomena as early as 700 BC Experiments with amber and magnetite Electricity and Magnetism, Some History, 2 1600 William Gilbert showed electrification effects were not confined to just amber The electrification effects were a general phenomena 1785 Charles Coulomb confirmed inverse square law form for electric forces Electricity and Magnetism, Some History, 3 1819 Hans Oersted found a compass needle deflected when near a wire carrying an electric current 1831 Michael Faraday and Joseph Henry showed that when a wire is moved near a magnet, an electric current is produced in the wire Electricity and Magnetism, Some History, 4 1873 James Clerk Maxwell used observations and other experimental facts as a basis for formulating the laws of electromagnetism Unified electricity and magnetism 1888 Heinrich Hertz verified Maxwell’s predictions He produced electromagnetic waves Electric Charges There are two kinds of electric charges Called positive and negative Negative charges are the type possessed by electrons Positive charges are the type possessed by protons Charges of the same sign repel one another and charges with opposite signs attract one another Electric Charges, 2 The rubber rod is negatively charged The glass rod is positively charged The two rods will attract Electric Charges, 3 The rubber rod is negatively charged The second rubber rod is also negatively charged The two rods will repel More About Electric Charges Electric charge is always conserved in an isolated system For example, charge is not created in the process of rubbing two objects together The electrification is due to a transfer of charge from one object to another Conservation of Electric Charges A glass rod is rubbed with silk Electrons are transferred from the glass to the silk Each electron adds a negative charge to the silk An equal positive charge is left on the rod Quantization of Electric Charges The electric charge, q , is said to be quantized q is the standard symbol used for charge as a variable Electric charge exists as discrete packets q = ± Ne N is an integer e is the fundamental unit of charge | e | = 1.6 x 10-19 C Electron: q = - e Proton: q = + e Conductors Electrical conductors are materials in which some of the electrons are free electrons Free electrons are not bound to the atoms These electrons can move relatively freely through the material Examples of good conductors include copper, aluminum and silver When a good conductor is charged in a small region, the charge readily distributes itself over the entire surface of the material Insulators...
View Full Document

{[ snackBarMessage ]}

Page1 / 67

chapter23 - Chapter 23 Electric Fields Electricity and...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online