Physics Help Forum Force between magnets

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 Aug 24th 2017, 11:21 AM #1 Junior Member   Join Date: Aug 2017 Posts: 4 Force between magnets How to calculate the force (in the vertical direction) acting on the middle magnet? https://upload.wikimedia.org/wikiped...Maglev-Lev.png
Aug 24th 2017, 11:32 AM   #2
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 Originally Posted by Kamil19991 How to calculate the force (in the vertical direction) acting on the middle magnet? https://upload.wikimedia.org/wikiped...Maglev-Lev.png
Numerically. What you posted is a complex system. It's not clear to me what the exact magnetic field generated by the middle magnet is.

When it comes to things like this there's no ready solution because there's no closed form expression for the magnetic fields of the magnets you posted nor is it clear what that middle thing is. I haven't calculated those things in many years so I can't recall whether we need to know what material the middle magnet is made of.

Perhaps others here can be more helpful.

 Aug 24th 2017, 01:13 PM #3 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,333 In order to levitate the train the sum of the upward forces acting on the two middle magnets (which are attached to the train) must equal the weight of the train. Hence the force on each of the two middle magnets is equal to 1/2 the weight of the train.

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