202 Sources of the Magnetic FieldAdditional ProblemsP30.48BIRRRIR=+=µµ02223205222ejIBR==×××⋅−−227 00 106 37 104100567µπ..T mTmAsoI=×201 109. Atoward the westP30.49Consider a longitudinal filament of the strip of width drasshown in the sketch. The contribution to the field at point Pdue to the current dIin the element drisdBdIr=02wheredIIdrw=FHGIKJBBkk=+FHGIKJzz+dIdrwrIwwbbbw001±ln±.FIG. P30.49P30.50Suppose you have two 100-W headlights running from a 12-V battery, with the whole 20017W12 V=Acurrent going through the switch 60 cm from the compass. Suppose the dashboard contains littleiron, so ≈0. Model the current as straight. Then,BIr×−−075201720610af.~ T.If the local geomagnetic field is 5 105×−T, this is ~101−times as large, enough to affect thecompass noticeably.
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .