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Iron - use a bunch of iron nails, wrapped many times with insulated copper wire, if making your own electromagnet.
no
no
It has to be a magnetic material, iron is the best. Mild steel is ok but stainless steel not.
An electromagnet makes a great door lock. The steel in the door will stay put until the electromagnet is turned off.
Iron - use a bunch of iron nails, wrapped many times with insulated copper wire, if making your own electromagnet.
no
Only if the steel bolt has been magnetised, or is the core of an electromagnet.
An electromagnet is a stronger magnet.
no
no
using a magnet: steel atracts and aluminum doesn't
An electromagnet, or any magnet, only attracts certain metals like iron. (Steel is a kind of iron.) If you want to remove, for example, aluminum splinters, you must use another process because aluminum is not attracted to a magnet.
electromagnet
Every thing except a conducting wire, battery and a soft iron core is not needed for making an electromagnet
Steel
You use a standard HSS bit for mild steel.