On this day in history, Columbus discoveredâ¦. the perfect meatball wink emoticon. Little known fact: Also on this day he discovered Spaghetti Warehouse and their $6 World Famous Spaghetti & Meatball Entree with sourdough bread and choice of soup or salad!
Relevance. Rating Newest Oldest. Best Answer: In a generator, residual magnetism, also known as 'remanence' or remanent flux, is due to the hysteresis of the magnetic material in the core. When the current is removed, the magnetic flux often remains at some non-zero value. This is a characteristic phenomenon of ferromagnetic materials.
Diamagnetism refers to materials that are not affected by a magnetic field. Paramagnetism refers to materials like aluminum or platinum which become magnetized in a magnetic field but their magnetism disappears when the field is removed. Ferromagnetism refers to materials (such as iron and nickel) that can retain their magnetic properties when the magnetic field is removed. Ferro is the Latin word for iron (this is the reason behind the atomic symbol of iron- Fe), a material which displays strong magnetic properties.