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A Will capacitors react to external electric field

  1. Sep 28, 2016 #1
    magnetic.png
    1. Passage of current via coil creates magnetic field (fig a), similarly external magnetic field linked to coil when changed created electric current in the circuit connected ( Faraday's em induction fig b).
    2. Charging of capacitor using voltage source creates electric field in the capacitor (fig c)
    But the question is if a capacitor exposed to an external electric field (changing or static, fig d) will there be a voltage induced across the plates of the capacitor ? all your answers are welcomed.
     
  2. jcsd
  3. Sep 28, 2016 #2

    mfb

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    Staff: Mentor

    The electric field as in your sketch cannot exist - it goes along the wires, but the wires of (ideal) conductors are at the same potential.
    The definition of an "external" field is quite tricky, partially due to this problem.
     
  4. Sep 28, 2016 #3
    Bro there are many ways to create external electric fields in real.
    1. Sphere of van de graff generator
    2. You take a simple solinoid coil and change the current through it, then the magnetic field will change because of which there will be electric field created in space perpendicular to changing magnetic field.
    3. lastly check out this on google "mislavskij transformer" where a guy charges a capacitor with electric field that resulted because of a changing magnetic field of a coil
    Mislavskij-Transformer-P1 (1).jpg
     
  5. Sep 28, 2016 #4

    mfb

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    Staff: Mentor

    Then you are creating a field inside. Not that external. Yes, that will lead to a voltage in the capacitor circuit.
     
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