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Electromagnetism

Electromagnetism. Physics 100 Chapt 15. Michael Faraday. General circuit. I. Appliance. -. +. I. +. -. Energy source (device that separates + & - charge). Moving a Conductor in a B-field separates + & - charges. I. Use this to drive an electric circuit. +. +. +. +. I. +.

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Electromagnetism

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  1. Electromagnetism Physics 100 Chapt 15 Michael Faraday

  2. General circuit I Appliance - + I + - Energy source (device that separates + & - charge)

  3. Moving a Conductor in a B-fieldseparates + & - charges I

  4. Use this to drive an electric circuit + + + + I +

  5. Moving wire loop in a B field v + + An electric current is “induced” in the loop

  6. Either the magnet or the loop can move v + + an electric current is “induced” in the loop

  7. Magnetic flux (F) thru a loop F = BA┴

  8. Flux thru a coil of N loops F = NBA┴

  9. Faraday’s law Michael Faraday change in F elapsed time Induced voltage in a circuit = change in NBA┴ elapsed time EMF = “Electro-Motive Force”

  10. Rotating coil in B field B A┴ = 0  F =0

  11. Rotating coil in B field B A┴ = Acoil F = maximum

  12. Rotating coil in B field B A┴ = 0 (again)  F = 0

  13. AC voltage

  14. Lenz’ Law B B S B-field from induced current + + B-field from induced current I N v v the fall produces an induced current the B-field produced by the induced current tries to impede the fall

  15. Lenz’ law An induced voltage always gives rise to an electric current that creates a magnetic field that opposes the influence that produced it.

  16. Maglev trains

  17. Maglev

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