How does a tool magnetizer and demagnetizer work?
How does a tool magnetizer and demagnetizer work? These things (pictured below). I get how the magnetizer works: a permanent magnet magnetises the tool bit, but how is the magnetic fields arranged in the demagnetizer in order to demagnetize tools? These things are unpowered completely passive blocks, presumaly containing a magnet and some iron/steel parts. [...]