Materials Only iron, steel, nickel and cobalt are magnetic. Bar magnets have to be made using one of these substances.
The Earth itself has a huge magnetic field - as if it had a huge bar magnet embedded at its centre. The Earth’s magnetic field lines emerge from near.
Magnets. Magnets are everywhere. Earth! In fact you live on the biggest magnet around …. If you have ever used a computer, microwave oven, or stereo speakers,
