Answer to Question #172789 in Electricity and Magnetism for Mohammad Aamir

Question

How can you magnetize an iron bar of the Earth is the only magnetic around?

Answer 1

Stroking method

A bar of steel can be magnetised by stroking it with a bar magnet. The domains become aligned, and a N pole and a S pole arе induced.

Hammering

If a steel bar is placed so that it lies in the direction of the magnetic field lines of a strong magnet and then hammered gently, the domains will begin to line up in the direction of the field. As they do, the steel bar itself becomes magnetised. The effect can be increased by slightly heating the steel bar first.