The Earth As a Magnet:

Objectives:

    1.    Describe the magnetic poles and magnetic field of earth.

    2.    Distinguish between the geographic and magnetic poles.

    3.    Explain the behavior of compasses.

Resources:

 

Notes:

The earth as a magnet:

The earth behaves as a giant bar magnet.   

Earth’s magnetic poles:

 

Magnetism and Domains:

Magnetism is due to the motion (spin) of electrons.  As electrons spin on their axes, they create both an electric and a magnetic field.

magnetic domains

 

 

 

a magnet

(207.10.97.102/.../lessons/everywhere/ magnetism/domain1.gif)

  One method of charging is magnetic induction which lines up the many unpaired electron fields creating a magnetic domain.

This charging is not permanent as the domains eventually move back to their original position and the material looses its magnetic properties.

(www.ece.uiuc.edu/alumni/ su01/spin.jpg)