WAEC - Physics (2022 - No. 20)
The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called
ferrite substance
paramagnetic substance
ferromagnetic substance
diamagnetic substance
Vysvetlenie
Ferrite magnets are non-conductive aferromagnetic ceramic compounds derived from iron oxides such as Haematite (Fe203) or Magnetite (Fe304) and other metal oxides such as Barium and Strontium.
Ferrite is a polycrystal, sintered material with high electrical resistivity. The high resistance of ferrite makes eddy current losses extremely low at high frequencies.