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MAGNET N52 Neodymium?

How do.

I am a complete beginner when it comes to neodymium magnets apart from that they are very strong. I have a N52 magnet 70mm width 20mm thick and unfortunatly i took a bit out of the magnet. It never broke into 2 pieces but it did take a bit out of the side

Just wondering if this will affect the power of the Magnet and if it does is it a significant amount?

thanks.
5% of the magnet MAX has gone

what us ring size is 20mm?

i where a US ring size 6-7, i want to get a neodymium magnet ring, most rings i find say 20mm, what size is that? how many mm are in a US size 6 or 7
this is the type of ring i want:

http://cgi.ebay.com/Magnetic-Ring-PK-Magic-trick-magnets-Neo-/220582958662?cmd=ViewItem&pt=UK_Collectables_MagicTricks_RL&hash=item335bc4d646

how much weight will two magnets repel, with the same poles facing, compared to how much one could lift?

hey, dunno if anyone knows this or not but i was wondering with neodymium rare earth magnets is the repelling strength comprable to how much they could lift, life if you had one that a website claimed could lift a 30lb block of steal, could two with the poles facing each other lift something 60lb? and i know the further away the two magnets got from each other, even by small emounts, the lifting force would decrease dramatically, but around how much, like with two 30lb mags facing each other, totaling 60 lbs of lifting theoreticaly, would that be only 60lbs if they where literaly touching each other, or could u get a milimeter or two itleast at that weight, or is the force of two magnets repeling each other even greater proportionaly to the lifting of one on steal, thanks to anyone that knows, i havnt been able to find much out about this, one magnet website i email said the repelling strength of two mags was 2/3’s the lifting, but they didnt specify the height u would be able to achieve and it sounded like they didnt put much thought into it really