What an electromagnet is, its strength and how it can easily be turned on and off.
How to Make a BIG and Powerful Electromagnet with the Primary of the transformer of a microwave oven. Remove the Secondary. With Iron or Steel (ferromagnetic materials) it attracts with a really great strength. With non ferrous metals like aluminum and copper it repels them due to Eddy currents. Courtesy of mopatin
How do magnets affect your electromagnetic devices? Learn about electromagnets!