Physics Help Forum The Effective Strength of Multiple Disc Magnets Stacked Together
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 Mar 29th 2009, 05:38 PM #1 Junior Member   Join Date: Mar 2009 Posts: 1 The Effective Strength of Multiple Disc Magnets Stacked Together 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: 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. (RE: Format, copy pasted from another forum that requires it)
 Mar 30th 2009, 01:29 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 Use a magnetometer/ magnetic needle and check the deflection for different stack lengths,making sure the closest point of the stack is always at the same distance from the needle. This should give you some idea.

 Tags disc, effective, magnets, multiple, stacked, strength

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