What type of materials can be used to make an electromagnet?

In a ferromagnetic material,below the Curie temperature,a domain is defined as:

$A$ small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is

Steel is preferred over soft iron for permanent magnets because

If a magnetic substance is kept in a magnetic field,then which of the following is thrown out?

$A$ ferromagnetic material is heated above its $Curie$ temperature. Which one is a correct statement?