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An electro
                                                      magnet is a
                                                      temporary
                                                       magnet .



                                                                    Factors
                             Electromagnets are used in
                            electric bell, an electric fan, an      nature of the core material
                           electric train, an electric motor,       strength of the current
                                 generator etc.
                                                                    number of turns of wire







                                                                Uses of permanent
                                         Permanent                  magnet
                                          magnets
                                                                  loudspeakers,
                                        nipermag and               ammeters,
                                           alnico.
                                                                   voltmeters,
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