Do magnets have a longer reach in a vacuum chamber?

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SUMMARY

Magnets do not exhibit a longer reach of attraction in a vacuum chamber compared to air. The magnetic permeability of air is only slightly greater than that of a vacuum, resulting in negligible differences in the attraction force. The shape and strength of the magnetic field around a magnet remain consistent regardless of the medium, whether it is air or a vacuum.

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Do magnets have a longer reach of attraction in a vacuum chamber?
 
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All else being equal, I don't think the attraction force would be significantly different in a vacuum than in air, because the magnetic permability of air is only slightly greater than the permability of a vacuum.
 
The permeability of the vacuum of free space is practically identical with that for air. So, no, the field around a magnet remains the same shape and strength.
 

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