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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (1)

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Post by Riley Argue on May 10, 2012

Thank you Professor Jishi

Electromagnetic Induction

  • Induced EMF: If a magnet and a coil move relative to each other, a potential difference, called electromotive force, is induced in the loop, and an electric current will exist in the loop, even though no battery is connected.
  • Motional EMF: If a conducting rod, of length L, is moved with a constant velocity v, perpendicular to its length, in a uniform magnetic field B, an emf will be induced in the rod, given by emf = L B v.

Electromagnetic Induction

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Induced EMF 0:51
    • Electro Motive Force
    • Hang a Wire Loop and Using a Magnet
    • Magnetic Field is Strong
    • Induced EMF is Not Related
  • Motional EMF 11:43
    • Conducting Metal
    • Rod Moves to Right
    • Force Exerted on Charge Carrier
    • Potential Difference
  • Example 25:57
    • Rod in Magnetic Field, Connected by Wires
    • Power Dissipated
    • In 1 Minute, Total Energy Consumption
  • Where Does the Energy Come From 37:50
    • Magnetic Waves with Conductive Bar
    • To Keep the Rod Moving With Constant Velocity
    • Work Done By External Agent in 1 Min
  • Relation to Magnetic Flux 51:03
    • Area Swept by Rod
  • Magnetic Flux 57:34
    • Magnetic Field is Constant
    • Area Perpendicular To field
  • Extra Example 1: Motional EMF of Rod
  • Extra Example 2: Motional EMF, Current, Power
  • Extra Example 3: Current in Resistor