Magnet lifting a stack of sheetmetal - GIF

[Frank S]

Unless they were doing this for video click bait demonstration, an experienced operator would have brought the magnet in contact with the stack of sheet metal before energizing the magnet, the way most operators do at all of the scrap yards I've ever visited. The only time they will air gap energize is when they are trying to pull a specific piecs of metal out of a bundle or pile.