![]() ![]() You can see electricity in the flash of a lightning bolt, but when a compass needle points to magnetic north, you can’t see any force causing it to rotate. 11.2: Magnetism and Its Historical Discoveries Magnetism has been known since the time of the ancient Greeks, but it has always been a bit mysterious.The connection between electricity and magnetism is fascinating from a theoretical point of view, but it is also immensely practical, as shown by an industrial electromagnet that can lift thousands of pounds of metal. Once we are more familiar with magnetic effects, we can explain how they arise from the behavior of atoms and molecules, and how magnetism is related to electricity. 11.1: Prelude to Magnetic Forces and Fields Before we examine the origins of magnetism, we first describe what it is and how magnetic fields behave.
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