Chapter 5

Electricity and Magnetism

[Electricity, heat, and magnetism] are all by one and the same dynamical action.—Lord Kelvin, British scientist who developed a mathematical analysis of electricity and magnetism

As a kid, did you ever play with magnets? If you did, you probably know that a permanent magnet has a north pole and a south pole. You may not have known what they were called, but you most likely observed that one end of a bar magnet is attracted to the opposite end of another bar magnet. If you put them side by side with the wrong ends touching each other, they would flip around and right themselves so that the north pole of one magnet was stuck to the south pole of the other and vice versa.

Magnetism is an integral part of electricity. ...

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