I would have to go with the ease of producing one as compared to a traditional magnet, as well as the fact it can be turned off.
Armature
As current increases, the electromagnet strength will increase.
The electomagnet came from William surgeon in 1825
darhhh......
I assume you mean "soft iron" ... so that it quickly loses its magnetism when the current flow stops.
electric motors are an electomagnet spinning round, changing poles so that it can always repel magnets attached to the sides and therefore spin.
What is the Advantage and dis advantage of TCP/IP
advantage
advantage
what is the advantage & disadvantages of folk media
What are Dis advantage of multinational?" What are Dis advantage of multinational?"
what is advantage of bamboo?