Lecture 32a - Maxwells Equations Let there be light!...

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Maxwell’s Equations Let there be light!
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Maxwell’s Equations The relationships between electric and magnetic fields and their sources
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3 What have we seen so far… 0 enc Q A d E Gauss’ Law for Electric Fields What it says: How charges produce Electric field: Electric field lines begin and end on charges. (Charges are a source or a sink of electric field)
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4 What about for Magnetic Fields? ? A d B Fig.a Fig.b This pattern of magnetic field has never been observed
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5 Gauss’ Law for Magnetic Fields What it says: No magnetic charge. Magnetic field lines don’t have a beginning or end. They always form closed loops 0 A d B
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We have Ampere’s Law: What it says: Electric current produces Magnetic field: This type of electric field is curly, it forms closed loops (Right hand rule) loop thru i l d B 0
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dt d l d E B Loop We also have Faraday’s Law: What it says: Changing Magnetic flux produces Electric field: This type of electric field is curly, it forms closed loops
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°± °±
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Lecture 32a - Maxwells Equations Let there be light!...

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