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 Demagnetizing

A magnet can be destroyed by hammering  

 
 
This causes the molecules to become arranged at random with the poles pointing in lots of different directions.  

 
 
   

 

  
 
Heating a piece of magnetized iron or steel strongly in a flame will demagnetize it.  

 
 
This causes the molecules to become arranged at random with the poles pointing in lots of different directions.