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 ...

This generates a poloidal magnetic field that bends the plasma current into a circle (green vertical circle ... can fusion become a commercially viable energy source. Twisting the magnets can also ...

A permanent magnet is always magnetic. It has an invisible magnetic field. Only certain materials, such as iron, feel a magnetic force. Permanent magnets can come in lots of different shapes and ...