A magnetic crane is used to load and transport scrap iron.

i.                     It is not feasible to create a permanent magnet of a big size required to load and transport scrap iron.

ii.                    It is also not possible to store such a big magnet.

iii.                  Hence, we create a powerful electromagnet by passing a current through a big iron disc.

iv.                  Therefore, a magnetic crane is used to load and transport scrap iron.