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Homework Help: The Effective Strength of Multiple Disc Magnets Stacked Together

  1. Mar 29, 2009 #1
    I spent a long time just trying to find the right equation and it was no surprise that I did not understand a variable of it.

    1. The problem statement, all variables and given/known data

    Why is it that a tower of identical disc magnets behaves differently (is stronger than?) a single magnet.

    Known: NO NUMBERS
    Each disk is identical in every shape and form

    2. Relevant equations

    This is the equation I found: eq5.gif

    3. The attempt at a solution

    I figured that as more and more discs are attached 'L' increases, as it gets longer, however this causes the Flux density at x (Bx) to decrease. The only logical thing I got out of that is that the Residual flux density must increases as more are added. The only problem is, I don't know how much. As the magnets are identical, is the increase uniform (Br with one magnet = x, with two magnets = 2x, etc)? Exponential? Is there no change or is it the wrong equation?

    Thank you for your help.
    Last edited: Mar 29, 2009
  2. jcsd
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