Chapter_29 - Chapter 29 Electromagnetic Induction...

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Chapter 29 Electromagnetic Induction Responsible for sections 1-5, 7
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Overview of course • An electric charge in an electric field experiences a force (Chpt. 21) F E = q E • where vectors are bold • A moving charge in a magnetic field experiences a force (Chpt. 27) F B = q v × B
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Sources of electric and magnetic fields Maxwell’s equations • Electric charge creates conservative electric field E (Chpts. 21 and 22) • Magnetic monopoles do not exist (Chpt. 29) • Changing magnetic flux creates non-conservative E field (Chpt. 29) • Moving charge and changing electric flux create magnetic field B (Chpts. 27, 28, and 29)
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Demo: changing magnetic flux creates electromotive force (EMF) N S ammeter N S ammeter
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Maxwell’s third equation (Faraday’s law) Curl E non-conservative = d B /dt Integrate both sides over area E nc dl = d Φ B /dt around perimeter of area Φ B ≡∫ B dA over area E nc dl induced EMF (voltage) Induce EMF = d Φ B /dt
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Chapter_29 - Chapter 29 Electromagnetic Induction...

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