chapter19 - Chapter 19 Electric Forces and Electric Fields...

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

View Full Document Right Arrow Icon
    Chapter 19 Electric Forces and Electric Fields
Background image of page 1

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

View Full DocumentRight Arrow Icon
    Electricity and Magnetism, Some History Many applications Macroscopic and microscopic Chinese Documents suggests that magnetism was observed as early as 2000 BC Greeks Electrical and magnetic phenomena as early as 700 BC Experiments with amber and magnetite
Background image of page 2
    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
Background image of page 3

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

View Full DocumentRight Arrow Icon
    Electricity and Magnetism, Some History, 3 1820 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
Background image of page 4
    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
Background image of page 5

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

View Full DocumentRight Arrow Icon
    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
Background image of page 6
    Electric Charges, 2 The rubber rod is negatively charged The glass rod is positively charged The two rods will attract
Background image of page 7

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

View Full DocumentRight Arrow Icon
    Electric Charges, 3 The rubber rod is negatively charged The second rubber rod is also negatively charged The two rods will repel
Background image of page 8
    More About Electric Charges The net charge in an isolated system is always conserved For example, charge is not created in the process of rubbing two objects together The electrification is due to a transfer of electrons from one object to another
Background image of page 9

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

View Full DocumentRight Arrow Icon
    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 = N e N is an integer e is the fundamental unit of charge |e| = 1.6 x 10 -19 C Electron: q = -e Proton: q = +e
Background image of page 10
    Conservation and Quantization of Electric Charges, Example 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 The charges on the two objects are ±e, or ±2e, …
Background image of page 11

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

View Full DocumentRight Arrow Icon
    Conductors Electrical conductors are materials in which some of the electrons move relatively freely Free electrons are not bound to the atoms These electrons can move relatively freely through the material Examples of good conductors include copper,
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/20/2010 for the course PHYS PHYS 2412 taught by Professor Stone during the Spring '10 term at University of Toronto- Toronto.

Page1 / 98

chapter19 - Chapter 19 Electric Forces and Electric Fields...

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