102 lect10_handout - Physics 102: Lecture 10 Faraday's Law...

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Physics 102: Lecture 10, Slide 1 Faraday’s Law Physics 102: Lecture 10 Changing Magnetic Fields create Electric Fields
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Physics 102: Lecture 10, Slide 2 Last Two Lectures • Magnetic fields • Forces on moving charges and currents • Torques on current loops • Magnetic field due to – Long straight wire – Solenoid
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Physics 102: Lecture 10, Slide 3 Motional EMF V A metal bar slides with velocity v on a track in a uniform B field Moving + charges in bar experience force down (RHR1) Electrical current driven clockwise! Moving bar acts like a battery (i.e. generates EMF)!! F q (Recall that e- actually move, opposite current) + q I
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Physics 102: Lecture 10, Slide 4 Faraday’s Law of Induction: “induced EMF” = rate of change of magnetic flux f i ݂ ݅ • The principle that unifies electricity and magnetism – Generating electricity – Microphones, speakers, guitar pickups – Amplifiers – Computer disks and card readers
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Physics 102: Lecture 10, Slide 5 First a preliminary: Magnetic Flux • “Counts” number of field lines through loop. Uniform magnetic field, B , passes through a plane surface of area A . Magnetic flux Φ = B A (Units Tm 2 = Wb) Magnetic flux Φ B A cos( φ ) φ is angle between normal and B B φ B Note: The flux can be negative (if field lines go thru loop in opposite direction)
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Preflight 10.7 Compare the flux through loops a and b. 1)
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This note was uploaded on 02/05/2012 for the course PHYS 102 taught by Professor Carruba during the Spring '09 term at University of Illinois at Urbana–Champaign.

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102 lect10_handout - Physics 102: Lecture 10 Faraday's Law...

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