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mathavraj

how does current through one end of the capacitor comes out of the other end?

  • 3 months ago
  • 3 months ago

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  1. mathavraj
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    @UnkleRhaukus

    • 3 months ago
  2. UnkleRhaukus
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    When the capacitor is connected across a potential difference, current flow in one wire to one plate, and out though the other wire (from the other plate) but not through the dielectric in the middle, within the dielectric an electric field is set up

    • 3 months ago
  3. mathavraj
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    is this electric field uniform or non uniform?

    • 3 months ago
  4. UnkleRhaukus
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    it should be very uniform between the plates, but not as uniform at the edges

    • 3 months ago
  5. mathavraj
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    when the battery is connected first, the current varies gradually..so what happens to the field now?

    • 3 months ago
  6. UnkleRhaukus
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    The electric field strength is equal to the negative of the gradient of the electrostatic potential difference,

    • 3 months ago
  7. mathavraj
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    actually..in lecture 18..prof lewin says that electric field is changing inside the plates, while explaining the concept of displacement current.

    • 3 months ago
  8. UnkleRhaukus
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    yeah the electric field will be proportional to the displaced charge

    • 3 months ago
  9. mathavraj
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    how does charge get displaced through the dielectric?

    • 3 months ago
  10. UnkleRhaukus
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    The charge is only displaced from/to the plates, charge in the dielectric does not more

    • 3 months ago
  11. UnkleRhaukus
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    one plate accumulates charge the other plate looses charge

    • 3 months ago
  12. mathavraj
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    so..is displacement current something hypothetical?

    • 3 months ago
  13. mathavraj
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    @ganeshie8 @Potatoes.ramu

    • 3 months ago
  14. Potatoes.ramu
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    It has a dielectric !

    • 3 months ago
  15. Potatoes.ramu
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    And plates. Charges accumulate on the plates!

    • 3 months ago
  16. mathavraj
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    hmm..yeah..but what is displacement current?and how is it related with a changing electric field?

    • 3 months ago
  17. Potatoes.ramu
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    Displacement current is related to a time varying electric field!

    • 3 months ago
  18. mathavraj
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    okay..so how does the field change?

    • 3 months ago
  19. Potatoes.ramu
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    \[D= \epsilon(E) + P\]

    • 3 months ago
  20. Potatoes.ramu
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    Where epsilon is the permittivity of free space E is the electric field intensity And P is the polarization of the medium

    • 3 months ago
  21. mathavraj
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    okay..thanx..one last doubt..so the magnetic field varies as long as the capacitor is charging?

    • 3 months ago
  22. Potatoes.ramu
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    Yeah!

    • 3 months ago
  23. Potatoes.ramu
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    tHE flux also changes!

    • 3 months ago
  24. mathavraj
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    okay...now I have some idea abt this..thanx :)

    • 3 months ago
  25. Potatoes.ramu
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    Welcome!! :)

    • 3 months ago
  26. mathavraj
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    correct me if iam wrong...when the battery is connected,the charge accumulates in one plate and gets depleted in another and as the electric field steadily rises ,so the field and the flux vary in the dielectric as a result the magnetic field and flux also vary in the dielectric and so there is a displacement current only till the capacitor charges.

    • 3 months ago
  27. Potatoes.ramu
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    I don't know if the charge accumulates in one plate and gets depleted in the other...

    • 3 months ago
  28. mathavraj
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    yes it does..

    • 3 months ago
  29. Potatoes.ramu
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    Okay then :)

    • 3 months ago
  30. Kainui
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    Yes, you're right @mathavraj charge accumulates in one and an equal but opposite charge accumulates in the other. So this creates a stronger and stronger electric field, but your battery isn't getting any more powerful the more it transfers current from one end of the capacitor to the other, so the change in the electric field with respect to time becomes less and less. The idea behind a displacement current is it's just a way to look at the whole circuit as though there is an actual current flowing through the whole wire, when in reality the displacement current is sort of an imagined term. But a very important one. Originally it wasn't included until Maxwell discovered it and because of it he was able to describe electromagnetic waves since this is what implied the existence of a changing electric field.

    • 3 months ago
  31. mathavraj
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    you mean no one had thought about a changing electric field till Maxwell came?!!

    • 3 months ago
  32. mathavraj
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    I mean sorry..i asked it crudely...an increasing current in the wire means increasing field...but what puzzles me the most is why do we consider the change in field inside the dielectric so special than the changing electric field in the conductor wire?

    • 3 months ago
  33. Potatoes.ramu
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    Because of the capacity of the dielectric to store charge!

    • 3 months ago
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