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Engineering Science by Lloyd Dingle, Mike Tooley

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Chapter 20 Electromagnetism and inductors

20.1 The nature of magnetic flux

If we could break up a bar magnet into tiny fragments, each of these fragments would behave as a magnetic dipole, not as a collection of isolated poles. In other words, a large magnet can be thought of as being made up from a large number of tiny magnetic dipoles where the north and south poles are inseparable, as shown in Figure 20.1. If we could further break up these tiny fragments into the electrons and nuclei that constitute its atoms, we would find that even these elementary particles behave as magnetic dipoles.

Magnetism is a phenomenon associated with the spinning ...

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