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Induced Electric Field inside Faraday Cage

  1. Jun 14, 2015 #1
    Imagine there is a hollow toroidal conducting chamber and a long solenoid in the middle. When we power the coil, does the induced electric field "propagate" inside the chamber? My prediction is that the changing flux will cause induction regardless of the cage.

    Thank you.
     
  2. jcsd
  3. Jun 15, 2015 #2

    Simon Bridge

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    A Faraday cage does not suppress electromagnetic fields inside it - it just shields from external fields.
    Therefore any electricity/electromagnetism experiment inside a Faraday cage should proceed normally... the chamber walls you describe would be the boundary conditions for the Maxwel equations ... look up "wave guide".
     
  4. Jun 15, 2015 #3
    I am asking what if the solenoid is outside the chamber, in the middle of the toroid.
     
  5. Jun 15, 2015 #4

    davenn

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    Then reread Simon's first sentence :)
     
  6. Jun 15, 2015 #5
    His first sentence sounds to me like he has understood the question differently, as if the field is generated inside the chamber.
     
  7. Jun 15, 2015 #6

    davenn

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    Note the bolded section of what Simon said ... that is your answer

    if there is an internal field, it wont get out ... aka a microwave oven
    if there is an external field it wont get in eg ...

    Tesla18Dalek.jpg


    cheers
    Dave
     
    Last edited: Jun 15, 2015
  8. Jun 15, 2015 #7
    Thank you both.
     
  9. Jun 15, 2015 #8

    Simon Bridge

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    No worries :)
     
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