Science Questions

Would an anti-matter magnet attract iron?

Sat, 2nd Oct 2010

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Question

Phil asked:

Assuming it was possible to create a magnet made of anti-matter,†would it attract or repel anti-matter iron / normal Iron?

 

Would you have anti-magnetism or is magnetism the same in an antimatter universe as it is here if so why?

 

Answer

Dave -   It is a wonderful question.  The main difference we know about antimatter is itís got the anti-electrons with the opposite charge to normal electrons, so a positron has the opposite charge to a normal electron, and magnetism is all about charge.  Itís actually a sort of minor alteration, a minor tweak to the normal electric field which is due to relativity.  So Einstein's specialty of relativity predicts magnetism, and itís actually part of the way he worked out the theory in the first place.  And so, antimatter has got perfect normal charges.  It behaves normally, just in the opposite direction.  So, an antimatter magnet would behave Ė as far as I can work out, exactly the same as a normal magnet.  So it would attract both antimatter iron and normal iron.

Chris -   The difference being of course if it touched the antimatter.

Dave -   Yeah.  It would get immense amounts of energy released.  Although the question which nobody knows the answer to is whether it would be attracted or repelled by gravity.  So whether it would fall downwards or upwards, nobody knows.  No one has been able to measure that yet.

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Phil asked the Naked Scientists: Assuming it was possible to create a magnet made of anti-matter,†would it attract or repel anti-matter iron / normal Iron? Would you have anti-magnetism or is magnetism the same in an antimatter universe as it is here if so why? What do you think? steelrat1, Fri, 1st Oct 2010

It would attract both. In the case of iron, the iron atom is more positive on one side therefore the anti-matter magnet would attract it's negative side. In the ant-matter iron it would attract the anti-matter iron's positive side. Ron Hughes, Fri, 1st Oct 2010

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