Confused by a magnet

[Michael GilliganParticipant @michaelgilligan61133]

I have just bought this App [for the princely sum of £0.89]
**LINK**

https://apps.apple.com/gb/app/magnetometer-pro/id1457545269

Which gives a reading of around 3000 microtesla in close proximity to the magnet

… compared with a general background of about 150

No idea how accurate it might be, or even exactly where the magnetometer is located in an iPad Pro 9.7”

… but it seems like a pretty big number

MichaelG.

.

Edit: __ I have just found my bedtime reading : 

https://www.dlhonline.co.uk/media/wysiwyg/dlhonline/PDF/guide-to-permanent-liftin-magnets2.pdf

Very much the wrong scale … but there may be something useful there

Edited By Michael Gilligan on 23/12/2022 22:30:59

[Michael GilliganParticipant @michaelgilligan61133]

This App looks more generally useful/interesting : **LINK**

https://apps.apple.com/gb/app/phyphox/id1127319693

… and it’s free

MichaelG.

[Anonymous]

That looks right interesting. I shall try that as soon as I find out where the iPad went.

Thanks, Michael!

[Michael GilliganParticipant @michaelgilligan61133]

A quick check with my trusty Silva Compass [not a patch on Nick’s but it does fit nicely in the camera-bag] reveals that the bottom of the magnet, and thereby the whole of the pot, is a North pole.

MichaelG.

.

… I am now wondering what effect that single line of contact has on the magnetic performance

… would it be even more effective if the magnet was truly centred in the pot ?

The practicality of doing this is questionable, but I would welcome opinions.

Edited By Michael Gilligan on 24/12/2022 10:01:13

[peak4Participant @peak4]

Posted by Michael Gilligan on 24/12/2022 09:55:36:

A quick check with my trusty Silva Compass [not a patch on Nick’s but it does fit nicely in the camera-bag] reveals that the bottom of the magnet, and thereby the whole of the pot, is a North pole.

MichaelG.

.

That tallies with what I found on my simple countersunk one.
The side with the countersink was south

Bill

[Author]

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