Allright, I'm only 17 and I have some questions about electromagnets. Okay, say I have an electromagnet that had a holding value of 1700lbs. when there was no gap between the magnet and the metal object. My question is would this magnet be able to pick up the metal object if it were around 4 inches away from it, or what about if the metal object was only 1500lbs. Would it deffinetly be able to pick the metal up? And if it could pick the metal up would it be instant, or would it take time? The metal would be iron if that helps answer my question any easier. Also, when power is given to an electromagnet, is the magnetivity instantly there? Is there any delay in magnetivity from the moment electricity is put to it?