Lect_21_note

Lect_21_note - Chapter 31 - 2 Faradays Law Faradays law...

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Chapter 31 - 2 Faraday’s Law
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Faraday’s law B(t) E B d d dt Φ ⋅= Es ±
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Faraday’s law – something wrong? B d d dt Φ ⋅= Es ± d = ± 0
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Induced Electric Fields ± The induced electric field generated by a changing magnetic field is a nonconservative field ± is only true in special cases, where changing of magnetic field is zero. d ⋅= Es ± 0 B(t) E E d = ± 0
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Faraday’s law – Nonconservetive B d d dt Φ ⋅= Es ± B(t) E B d d Φ ± 0
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B d d dt Φ ⋅= Es ± Lenz’s Law ± Faraday’s law indicates that the induced emf and the change in flux have opposite algebraic signs ± This has a physical interpretation that has come to be known as Lenz’s law ± Developed by German physicist Heinrich Lenz
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Lenz’s Law ± Lenz’s law : the induced current in a loop is in the direction that creates a magnetic field ( B induce ) that opposes the change in magnetic flux through the area enclosed by the loop B(t) 0 E B induce
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Lenz’s Law ±
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_21_note - Chapter 31 - 2 Faradays Law Faradays law...

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