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Let's say I have a neodymium magnet with 20 lbs of force, and an electromagnet with 200 lbs of force. Is there a way I could figure out the maximum distance that they would attract each other?

- Thread starter Cocacolacan
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- #1

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Let's say I have a neodymium magnet with 20 lbs of force, and an electromagnet with 200 lbs of force. Is there a way I could figure out the maximum distance that they would attract each other?

- #2

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You would have to specify the shapes and dimensions and specify a threshold for the attraction.

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- #4

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- #5

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And I'm still not getting this threshold of attraction, have any links?

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- #10

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If you're going through air between the magnets,

the equation will be

F=Magnetic Permability constant*S1*S2/r2

That is, (4*pi)×10−7 N·A−2 times the strength of the pole of interest number one times the strength of the pole of interest number two divided by the distance that separates them squared.

You can put it onto a calculator, set R as X, and watch the force drop off into oblivion.

Hope this helps someone in the future.

- #11

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There is nothing clear about any of this. Magnets, for one, do not obey an inverse square law. And you've said nothing about this source of friction.

If you're going through air between the magnets,

the equation will be

F=Magnetic Permability constant*S1*S2/r2

That is, (4*pi)×10−7 N·A−2 times the strength of the pole of interest number one times the strength of the pole of interest number two divided by the distance that separates them squared.

You can put it onto a calculator, set R as X, and watch the force drop off into oblivion.

Hope this helps someone in the future.

- #12

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Alright then, what do magnets follow? And wouldn't friction be something that would be dealt with later? As I would find a force on the graph that would equal the normal force of the magnet?

Does anyone know an answer to this question, it is driving me nuts. (How to find the force between two magnets across a distance that are interacting in air?)

The magnets are both circular, one is an electromagnet and the other is a permanent magnet.

Would this question be better in the physics section of the forum?

Does anyone know an answer to this question, it is driving me nuts. (How to find the force between two magnets across a distance that are interacting in air?)

The magnets are both circular, one is an electromagnet and the other is a permanent magnet.

Would this question be better in the physics section of the forum?

Last edited:

- #13

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agreedThere is nothing clear about any of this. Magnets, for one, do not obey an inverse square law. And you've said nothing about this source of friction.

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