Transcription of Chapter Five MAGNETISM AND MATTER - NCERT
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Chapter Five MAGNETISM AND MATTER - NCERT
INTRODUCTIONM agnetic phenomena are universal in nature. Vast, distant galaxies, thetiny invisible atoms, humans and beasts all are permeated through andthrough with a host of magnetic fields from a variety of sources. The earth smagnetism predates human evolution. The word magnet is derived fromthe name of an island in Greece called magnesia where magnetic oredeposits were found, as early as 600 BC. Shepherds on this islandcomplained that their wooden shoes (which had nails) at times stayedstruck to the ground. Their iron-tipped rods were similarly affected.
Matter 177 dB ndxIa r x a = − + µ0 2 2[( ) ]2 2 32 The magnitude of the total field is obtained by summing over all the elements — in other words by integrating from x = – l to x = + l. Thus, 2 0 2 nIa B µ = dx l r x a l ∫ − [( ) ]− +2 2 3 2/ This integration can be done by trigonometric substitutions. This exercise, however , is ...
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