Lect17 - Physics 212 Lecture 17 Slide 1 Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 17, Slide 1 Physics 212 Lecture 17 Faraday’s Law ∫ Φ- = ⋅ = dt d d E emf B l a a Music Who is the Artist? A) Oscar Peterson B) Kenny Barron C) Dave Brubeck D) Thelonius Monk E) Marcus Roberts Why? Time to return to classic jazz Most unique piano player?? Check out the Jazz Biography CD (couldn’t find a picture) great recordings from 40’s and 50’s Also: MUST SEE DVD: “Straight No Chaser”: 2000 “Teardrop =( ” We’ll go through the concepts in some detail again. “I HAVE NO IDEA WHAT IS GOING ON! I think the best way to understand electricity would be to put a fork into an outlet.” “THIS LECTURE IS WAY TOO HARD” Physics 212 Lecture 17, Slide 3 Your Comments 05 “ I never thought I would B INtroDUCED to a concept as confusing as this” Checkpoints and demos! “The falling loop problem” “DEMOS” “The most difficult part of this section is determining which direction a current is induced when it has a changing magnetic flux through it.” “Everything is coming together, electricity and magnetism...woah!” Hour Exam II – Wed. Oct. 26: Lect 9-18 S i g n u p f o r c o n f l i c t s T O D A Y ! ( H a r d d e a d l i n e T h u . O c t . 2 1 0 : 0 p . m . ) “ Man, this stuff if giving me acid reFLUX.” Physics 212 Lecture 17, Slide 4 Faraday’s Law: Looks scary but it’s not – its amazing and beautiful ! A changing magnetic flux produces an electric field. Electricity and magnetism are deeply connected ∫ Φ- = ⋅ = dt d d E emf B l a a ∫ ⋅ ≡ Φ A d B B a a where *Remember: we started by applying to wires B v q F a a a × = Physics 212 Lecture 17, Slide 5 In Practical Words: 1) When the flux Φ B through a loop changes, an e m f is induced in the loop. There are many ways to change this… Faraday’s Law: ∫ Φ- = ⋅ = dt d d E emf B l a a where B A Think of Φ B as the number of field lines passing through the surface ∫ ⋅ ≡ Φ A d B B a a Physics 212 Lecture 17, Slide 6 B A In Practical Words: 1) When the flux Φ B through a loop changes, an e m f is induced in the loop. Change the B field Faraday’s Law: ∫ Φ- = ⋅ = dt d d E emf B l a a where ∫ ⋅ ≡ Φ A d B B a a Physics 212 Lecture 17, Slide 7 B A In Practical Words: 1) When the flux Φ B through a loop changes, an e m f is induced in the loop. Move loop to a place where the B field is different Faraday’s Law: ∫ Φ- = ⋅ = dt d d E emf B l a a where ∫ ⋅ ≡ Φ A d B B a a Physics 212 Lecture 17, Slide 8 B A In Practical Words: 1) When the flux Φ B through a loop changes, an e m f is induced in the loop. Rotate the loop Faraday’s Law: ∫ Φ- = ⋅ = dt d d E emf B l a a where ∫ ⋅ ≡ Φ A d B B a a Physics 212 Lecture 17, Slide 9 B A In Practical Words: 1) When the flux Φ B through a loop changes, an e m f is induced in the loop....
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Lect17 - Physics 212 Lecture 17 Slide 1 Physics 212 Lecture...

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