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Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: ciniva on 17/09/2017 20:12:31

Title: How does making holes in a magnet affect the magnetic field?
Post by: ciniva on 17/09/2017 20:12:31
This thread is related to this one https://www.thenakedscientists.com/forum/index.php?topic=71383.0
If there are holes in the magnet, do they reduce its magnetic field (ie. the power of the magnetic poles)?

* withholes.png (2.28 kB . 412x241 - viewed 2559 times)
My regards to all members
Title: Re: How does making holes in a magnet affect the magnetic field?
Post by: Kryptid on 17/09/2017 23:12:52
Although my knowledge of magnetism is ultimately limited (especially when it comes to the way that shape affects magnetic fields), I would say that any magnet with a hole in it would have a weaker field than one of identical shape without the hole. The reason being that the magnet without the hole would contain more total magnetized material.
Title: Re: How does making holes in a magnet affect the magnetic field?
Post by: evan_au on 18/09/2017 05:36:30
There is a maximum magnetic flux which a particular ferromagnetic material can stand before it enters "magnetic saturation".
If you require more magnetic flux, you have to increase the area.

Reducing the area (by drilling holes in it) will reduce the maximum magnetic flux.
So I agree with Kryptid's conclusion.

See: https://en.wikipedia.org/wiki/Saturation_(magnetic) (https://en.wikipedia.org/wiki/Saturation_(magnetic))
Title: Re: How does making holes in a magnet affect the magnetic field?
Post by: ciniva on 18/09/2017 17:34:39
Thank you guys for the answers.
My respect