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Magnetic Flux

Discussion in 'Electronic Basics' started by meyousikmann, Oct 22, 2006.

  1. meyousikmann

    meyousikmann Guest

    Ok, I have this arrangement:

    I -->
    ------------------------ long straight wire
    d
    ---------------
    | |
    L | |
    | | rectangular wire loop
    | |
    ---------------
    W

    d = the distance between straight wire and wire loop
    L = length of wire loop
    W = width of wire loop

    A sinusoidal current flows through the straight wire where the current is
    I(t) = 2.3 cos (41*10^6 t). What I am looking for is the maximum magnetic
    flux passing through the loop. I understand with a DC current, the equation
    ends up being:

    mu(naught)IW / 2pi * ln ((d + L) / d)

    This would be fine if it was a DC current because it is just a matter of
    plugging in numbers, however, since the current is sinusoidal, I ends up
    being a function of t and I am not given a t. Can anyone give me some
    pointers on how to figure the magnetic flux through the wire loop given a
    sinusoidal current?
     

  2. Redraw the image in a fixed width font, like Courier. What you
    posted is broken up from being created in an unknown variable width
    font.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  3. Bob Eld

    Bob Eld Guest

    The peak of the cosine wave is 2.3, it doesn't matter what "t" is. Remember,
    the cosine goes from plus one to minus one. Your only looking for the
    maximum or peak. The question does not ask anything about frequency or time.
    So don't answer what it doesn't ask.
     
  4. Tim Williams

    Tim Williams Guest

    Weird, in my Euclidean space I always measure it as exactly 1.

    Tim
     
  5. Bob Eld

    Bob Eld Guest

    Are you having a problem with the stated equation: I(t) = 2.3cos(41*10^6t)?
    Please tell us why the peak is not 2.3.
     
  6. meyousikmann

    meyousikmann Guest

    And therein lies the problem......I have a tendency to make things more
    difficult than they really are. Thanks for the pointer. It makes complete
    sense now.
     
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