How can you increase the strength of an electromagnet?
You can increase the strength of an electromagnet by either increasing the number of turns, and/or by increasing the current, and/or by increasing the ferromagnetic density (permeability) of the core.
There are a couple of ways to increase the strength of a copper electromagnet. You could increase the current going through the wire or wrap more wire around it which increases the strength exponentially. You could also put in a soft iron core such as a nail which in essence becomes a magnet and increases the strength of the magnet.
Iron core (usually soft iron core) is a highly ferromagnetic material. Ferromagnetic materials allows (and attracts) the magnetic field lines to pass through it. When such a material is used in the electromagnet, the magnetic field lines passing through it increases, thereby, the strength of the electromagnet increases. So my friend, I hope you are satisfied with the answer.
To increase the strength, the simplest way is to increase the Current. Given V=IR, we can increase the voltage or decrease the resistance. Since huge amounts of energy are required to generate electricity, reducing the resistance is cheaper. In MRI scanners, a huge field density of 1.5 Tesla is required. To get this we use super-cooled niobium-tin alloys to get almost 0 resistance. In the LHC, niobium-titanium alloys are used to maintain very low resistance…