* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download SurveyMotors
Casimir effect wikipedia , lookup
Skin effect wikipedia , lookup
Magnetometer wikipedia , lookup
Mathematical descriptions of the electromagnetic field wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Magnetotactic bacteria wikipedia , lookup
Multiferroics wikipedia , lookup
Magnetoreception wikipedia , lookup
Magnetotellurics wikipedia , lookup
Electromotive force wikipedia , lookup
Electric machine wikipedia , lookup
Magnetochemistry wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Electricity wikipedia , lookup
Superconducting magnet wikipedia , lookup
Electromagnetic field wikipedia , lookup
Ferromagnetism wikipedia , lookup
Force between magnets wikipedia , lookup
History of geomagnetism wikipedia , lookup
Electromagnetism wikipedia , lookup
Faraday paradox wikipedia , lookup
Magnets Two poles of the same kind repel each other. Two poles of the opposite kind attract each other. 1 Field lines The lines show the direction of force on a north pole. In the early 1800’s, Michael Faraday notes that iron filings line up around a magnet to show “force field lines”. 2 Electromagnets In 1820 Hans Christien Ørsted discovers that an electric current in a wire creates a magnetic field. This is the principle behind the electromagnet. 3 Lorentz force In 1892 Hendrick Lorentz discovers that a current-carrying wire feels a force when it is in a magnetic field. This is the principle behind the electric motor. The force on the electrons is out of the page. Why did it take him so long??? The force on the current is perpendicular to the magnetic field and perpendicular to the current. (If the current is in the same direction as the field, there is no force.) 4