But a magnetic field is a magnetic field, and copper wire is copper wire. So why the variation in quality? If the difference between a good quality pup and a poor quality pup is the number of windings for instance, then why don't the poor quality manufactures simply add a few more windings and flog the better pups for a larger profit? Or perhaps buy a better quality magnet for a few extra coins and do the same?
Surely the effort required to make a bad pup, is the same as to make a good pup.
So why are there so many bad pups?
Or dogs I suppose you could say..
Woof!