Question

You are given an iron needle explain how can you magnetize the needle

Answer 1

connect the needle to a cell through conducting wire with a switch then switch on the cell ,when current pass through the needle it creates magnetic field

Answer 2

Given a piece of iron and a bar magnet, the piece of iron can be magnetised by single touch method wherein one pole of a magnet is used to stroke the iron piece from its one end to the other end repeatedly until it gets magnetised.