Date: 9/05/2015 15:03:24
From: Thomo
ID: 719937
Subject: Rare Earth Magnets

Just a quick Q
Is a 5mm thick Rare Earth Neodymium N35 Magnet more powerful than a 2mm thick one ?
Do two magnets stuck together have more “stick “ (I’m guessing attraction the Branes may call it ) than one magnet and a piece of steel ?

Thanks

Brett

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Date: 9/05/2015 17:33:21
From: Thomo
ID: 719995
Subject: re: Rare Earth Magnets

From https://van.physics.illinois.edu/qa/listing.php?id=17013

I want to use two counter sunk disc magnets in a coupling device. They are sold as a pair with opposing fields. They are rated at 5.35 lbs. each. My question is when put together is the force needed to separate them double that of their individual rating?
- Tim Moen (age 57)
Cabool, Missouri, USA
A:

Hello Tim,

The force separating the two identical magnets should be about the same as of one magnet stuck to a steel plate. The reason is that when one magnet approaches the plate, it effectively ‘sees’ its mirror image and is attracted to it with the same force as a real one.

I did a simple experiment with some bar magnets I have around the lab and just making a guess it seemed like the two separation forces were the same.

Well thats one Q answered
Bit counter intuitive

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Date: 10/05/2015 03:05:33
From: mollwollfumble
ID: 720185
Subject: re: Rare Earth Magnets

Thomo said:


Just a quick Q
Is a 5mm thick Rare Earth Neodymium N35 Magnet more powerful than a 2mm thick one ?
Do two magnets stuck together have more “stick “ (I’m guessing attraction the Branes may call it ) than one magnet and a piece of steel ?

Thanks

Brett

Um, I’ll give that a bit of thought and get back to you. I have a book here somewhere about the science of magnetism, I’ll try to find it.

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