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Simon Bridge
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Nov30-12, 09:19 AM
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You are self taught and doing a PhD?!
Way to go!

Have you told your supervisor about what is happening to your magnets?

Anyway - you are thinking, I imagine, that if you join two small magnets together you should get one magnet of greater strength - so grinding them down should weaken them?

Conceptually: sketch the field lines for two equal strength bar magnets lined up like so:

[N1S][N2S]

... all the lines from the N of 1 go in to the S of 2, and all the lines from the N of 2 go into the S of 1. So what happens to the magnet strength close to the poles of the combined magnet compared with the separated magnets?

You know how permanent magnets work right?