Difference between Electric flux density,electric field strength .

  1. Difference between Electric flux density,electric field strength.....

    I want to know the difference between,electric flux density and electric field strength.Are they the same?
    And also,there is a magnetic field(measured in Tesla),magnetic flux(in Weber),magnetic flux density(Weber per m2),magnetic field strength(measured in Tesla again?).
    I am finding these very confusing.Can someone clear this out?
    Thanks
     
  2. jcsd
  3. tiny-tim

    tiny-tim 26,043
    Science Advisor
    Homework Helper

    hi sachin123! :smile:

    from the pf library on flux …
    In electromagnetism, flux always means total flow through a surface (a scalar), and is measured in webers (magnetic flux) or volt-metres (electric flux).

    Flux is the amount of a vector field going through a surface: it is the integral (over the surface) of the normal component of the field​

    flux density (btw, this is density per area, not per volume) is the same as the field …

    flux = ∫ field "dot" area, so field = flux per area = flux density …

    tesla = weber/metre2 :wink:

    (and "strength" just means "amount" …

    you can leave it out when writing, and ignore it when reading :wink:)​

     
  4. Re: Difference between Electric flux density,electric field strength.....

    I am clear with Electric field strength(=electric flux density) and electric flux.

    1.)Does it mean that magnetic field strength=magnetic flux density?

    and...
    from what you said,
    magnetic field strength = magnetic field.


    But,here is what my book says:
    Magnetic field strength (H)=B/[tex]\mu[/tex]
    where B is magnetic flux density.
    Now weren't they supposed to be the same?(magnetic flux density and Magnetic field strength)
     
    Last edited: Feb 20, 2011
  5. tiny-tim

    tiny-tim 26,043
    Science Advisor
    Homework Helper

    ah, i see …

    your book is calling H (in amps per metre) the magnetic field strength …

    i haven't come across that before …

    i've seen magnetic field intensity for H, but not strength :redface:

    oh, in that case forget what i said about ignoring the word "strength": clearly some books are using it to distinguish H from B (in webers per metre squared)

    (but the best way to distinguish them is to call them the H-field and the B-field :wink:)
     
  6. Re: Difference between Electric flux density,electric field strength.....

    So,to conclude it,

    magnetic flux is number of magnetic lines passing through surface area.......
    unit:weber

    magnetic flux density is number of magnetic lines passing through unit surface area.......
    unit:weber per (m square)

    magnetic field is same as magnetic flux density

    magnetic field strength =magnetic field intensity is H =B/(mu)
    unit:A per m

    Is it correct?:smile:
     
    Last edited: Feb 20, 2011
  7. Re: Difference between Electric flux density,electric field strength.....

    'mu' i meant as [tex]\mu[/tex]
     
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