Question

The most suitable material to be used as the core of an electromagnet is _____ (soft, hard) iron.

Answer 1

First let us see what an electromagnet is:
An electromagnet is a kind of magnet where the magnetic field is created by an electric flow. Electromagnets for the most part comprise of wire twisted into a coil. A current through the wire makes a magnetic field which is packed in the middle of the coil.

Complete step by step answer:
At the point when an electric current flows in a wire, it makes an attractive field around the wire. This effect can be utilized to make an electromagnet. A basic electromagnet contains a length of wire transformed into a loop and associated with a battery or power supply, enveloping the coil over a bit of iron.
Moving charges make attractive fields, so when the loops of wire in an electromagnet have an electric current flowing through them, the coils act like a magnet.
Soft iron core is utilized to make electromagnets as its profit and losses magnetism rapidly relies upon the presence of magnetic fields. The armature is additionally made of soft iron which can initiate magnetism quickly.
Soft iron is ferromagnetic in nature and consequently which helps in reinforcing the magnetic field lines in the centre as the quantity of the lines are increased in the centre. This is useful in expanding the sensitivity of the moving coil galvanometer.

Hence, the most suitable material to be used as the core of an electromagnet is soft iron.

Note: Although soft iron is used in electromagnets but it is quite rare and expensive. So, things like iron nails are used.