iron, cobalt or nickel and attract or repel other magnets.   Magnetic fields are very widely used throughout modern technology, particularly in electrical engineering and electromechanics. The Earth produces its own magnetic field, which is important in navigation. Rotating magnetic fields are used in both electric motors and generators. Magnetic forces give information about the charge carriers in a material through the Hall effect. The interaction of magnetic fields in electric devices such as transformers is studied in the discipline of magnetic circuits.උපුටාදැක්වීම් දෝෂය: "nb" නම් කණ්ඩායම සඳහා <ref> ටැග පැවතුණත්, ඊට අදාළ <references group="nb"/> ටැග සොයාගත නොහැකි විය.↑ Jiles, David C. (1998). Introduction to Magnetism and Magnetic Materials (2 ed.). CRC. p. 3. ISBN 0412798603.↑ Feynman, Richard Phillips; Leighton, Robert B.; Sands, Matthew (1964). The Feynman Lectures on Physics. Vol. 2. California Institute of Technology. pp. 1.7–1.8. ISBN 0465079989.මුස්නව යනු අනුරාධ