Iron is magnetically soft – it can be easily magnetised and demagnetised. Magnetic fields lines are invisible but they fill the space around a magnet where the magnetic forces work on magnetic ...

If you need help visualizing magnetic fields, these slow-motion video captures should educate or captivate you. Flux lines are difficult ... for a person used to a bar magnet.

but it's still close enough to the planet that the magnetic field is neat and orderly, more like a bar magnet. Farther out in the tail, the lines of Earth's magnetic field have been stretched and ...

This means that their magnetism is there all the time and cannot be turned on or off as it can with an electromagnet. Converting a magnet to a non-magnet is called demagnetisation. Magnets are ...