Transcription of Chapter Four MOVING CHARGES AND MAGNETISM
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Chapter Four MOVING CHARGES AND MAGNETISM
INTRODUCTIONBoth Electricity and MAGNETISM have been known for more than 2000years. However, it was only about 200 years ago, in 1820, that it wasrealised that they were intimately related*. During a lecture demonstrationin the summer of 1820, the Danish physicist Hans Christian Oerstednoticed that a current in a straight wire caused a noticeable deflection ina nearby magnetic compass needle. He investigated this found that the alignment of the needle is tangential to an imaginarycircle which has the straight wire as its centre and has its planeperpendicular to the wire. This situation is depicted in (a). It isnoticeable when the current is large and the needle sufficiently close tothe wire so that the earth s magnetic field may be ignored. Reversing thedirection of the current reverses the orientation of the needle [Fig. (b)].The deflection increases on increasing the current or bringing the needlecloser to the wire. Iron filings sprinkled around the wire arrangethemselves in concentric circles with the wire as the centre [Fig.]
Physics 136 E XAMPLE 4.1 drift velocity v d (see Chapter 3). In the presence of an external magnetic field B, the force on these carriers is: F = (nAl)q vd × B
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