Magnetism
Natural and artificial magnets produce a field in which magnetic influence is detected, including Earth's protective and navigational field.
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Magnets and Magnetic Fields
Natural and artificial magnets produce a field in which magnetic influence is detected, including Earth's protective and navigational field.
Open article →Field Lines, Flux and Flux Density
Field lines represent direction, while flux and flux density describe how many field lines cross an area or a unit normal area.
Open article →Magnetic Effect of Current
Oersted's compass experiment showed that current creates a magnetic field whose circular direction follows the right-hand thumb rule.
Open article →Magnetic Force and Fleming's Left-Hand Rule
A current-carrying conductor in a magnetic field experiences force F=ILB; the left-hand rule gives direction, while parallel currents attract or repel by direction.
Open article →Electromagnetism and Electric Motors
Electricity and magnetism form electromagnetism, and a motor uses force on a current-carrying coil to convert electrical energy into mechanical motion.
Open article →Electromagnetic Induction and Direction
Changing magnetic flux produces induced emf; Lenz's law and Fleming's right-hand rule determine the induced current's direction.
Open article →Electric Generators
An AC generator rotates an armature between magnetic poles so changing flux induces a current that reverses each half rotation.
Open article →Transformers
A transformer uses electromagnetic induction and coil-turn ratios to raise or lower alternating voltage and current.
Open article →Electromagnet Uses in Speakers and Medicine
Changing electromagnetic fields drive speakers, levitate and propel trains, and support medical imaging and treatment equipment.
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