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Physics54S09II - Ch 28 Sources of the Magnetic Field L12...

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Ch 28: Sources of the Magnetic Field L12 Memorize this! Focus: Amperes Law, Line Integral of B Ampere’s Law (1775-1836) I d 0 μ = l B ANY Loop Current INSIDE Loop B ? I B Right Hand Rule! RH Screw along I Ampere’s Law always true, but useful for finding B if there is Symmetry Line integral of B is zero. I out I in Equal currents in/out B l d B B l d
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Ch 28: Sources of the Magnetic Field L12 I d 0 μ = l B Example : B-Field outside long wire. r I 0 B Direction of B ? Direction of d l ? d l Does B change magnitude around loop ? wire 0 0 0 0 for 2 ) ( ) ( 2 R r r I r B I r rB > = = π μ μ π What is B if we look inside the wire exactly at the center ? m/A T 10 4 7 0 × = π μ
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