University of Nottingham
Sixty Symbols: Symbols of Physics and Astronomy: Magnetic Fields
Scientists explain what a magnetic field is, in everyday science and in astronomy. See examples of magnets and magnetic fields, as well as an example of an electromagnet. [8:25]
Khan Academy
Khan Academy: Discovery of Magnetic Fields
Magnetic materials seem to have two sides (we could call them poles). Depending on orientation, they can be attractive or repulsive. What is the shape of the force between fields? [1:07]