Electromagnet are made of soft metal core made into a magnet by the passage of electric current through a coil surrounding it.
A permanent magnet retains its magnetic properties for a long time. A temporary magnet acts as a magnet only as long as it is in the magnetic field produced by a permanent magnet or an electric current.
Superconductors are substances capable of becoming superconducting at sufficiently lowtemperatures.
North poles point north, south poles point south.
Magnetic forces attract only magnetic materials.
- Magnetic forces act at a distance.
- While magnetized, temporary magnets act like permanent magnets.