They need not be. Many electromagnets are circular disks or toroidal (donut shaped). Bar magnets, not surprisingly, are bar shaped - often with a rectangular cross section.
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Magnets also come in different strenghs
Magnets can be made from many different metals so there is no specific atomic mass.
Like magnets.
Nothing Neither the words 'magnet', 'magnets' nor 'lodestone' are mentioned in the King James version.
in alternators