What Is A Permanent Magnet Which Can Turn Freely In The Earth's Magnetic Field. A magnetic needle mounted on a pivot so it can turn freely a dial to show the direction. If a permanent magnet motor is spun with the leads disconnected it makes very high voltage in the open circuit.
The simplest theory on the origin of the earths magnetism is that the center of the earth is one huge permanent magnet made of iron and nickel. The north pole north-seeking pole of the compass needle points towards the Earths north pole. Earths core consists mainly of these two mainly materials these theory seems acceptable at first.
The magnetic field cannot be turned on and off it is there all the time.
A permanent magnet is a magnet that is permanent in contrast to an electromagnet which only behaves like a magnet when an electric current is flowing through it. Inside atoms and crystals you have both electrons and the nucleus of the atom. Key features of a permanent magnet. Laboratory studies show that iron loses its magnetism at 770C and nickel at 358C.
