Ian ... explain this please

Easy peasy - the round one had a toke or two :D

Seriously - magnetism, temporary, pure and simple :)
 
Yup, Flops hit the nail on the head :D The liquid nitrogen cools the material to become a superconductor (there are some computing applications behind this too), and hence creates a temporary magnetic field. :thumb:
 
christopherpostill said:
where can i buy liquid nitrogen i want some
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:thumb:
 

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