* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Chapter 6 Lesson 3
Skin effect wikipedia , lookup
Magnetosphere of Jupiter wikipedia , lookup
Geomagnetic storm wikipedia , lookup
Electromotive force wikipedia , lookup
Magnetosphere of Saturn wikipedia , lookup
Maxwell's equations wikipedia , lookup
Edward Sabine wikipedia , lookup
Mathematical descriptions of the electromagnetic field wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Magnetic stripe card wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Neutron magnetic moment wikipedia , lookup
Lorentz force wikipedia , lookup
Magnetometer wikipedia , lookup
Electric machine wikipedia , lookup
Magnetic nanoparticles wikipedia , lookup
Magnetic field wikipedia , lookup
Electromagnetism wikipedia , lookup
Magnetic monopole wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Magnetotactic bacteria wikipedia , lookup
Electromagnetic field wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Magnetotellurics wikipedia , lookup
Magnetoreception wikipedia , lookup
Multiferroics wikipedia , lookup
Magnetochemistry wikipedia , lookup
Superconducting magnet wikipedia , lookup
Electromagnet wikipedia , lookup
Ferromagnetism wikipedia , lookup
Chapter 6 Lesson 3 Magnetism Magnetism • Magnetism is the ability of an object to push or pull on another object that has the magnetic property. • Magnets have two poles: north (N) and south (S). • Like poles repel one another; different poles attract. • If you cut a magnet in half, each half will form a new magnet with two poles. Magnetic Field • Magnetic fields form around a magnet. • The forces around our planet create a Magnetic Field. Magnetic Field • If the poles of atoms line up in the same direction, a permanent magnet is formed. • The forces from the aligned poles of the atoms add up and give a magnet its strength. • The strength aligns into fields or waves. Magnetic Field Electromagnet • Electromagnet is an electric circuit that produces a magnetic field. The moving electrons in electricity generate magnetic fields. • The simplest electromagnet is a straight wire. The magnetic field circles around the wire when electric current is flowing. • The magnetism from each loop adds up to make the coil of an electromagnet. Electromagnet Electromagnet • A voice coil operates audio speakers. The voice coil sits in a permanent magnetic field. • Current changes in the coil and alters it’s magnetic field. This causes the forces to the permanent magnet to move it back and forth. • The coil’s vibrations make the cone move back and forth, creating sound waves in the air. How can magnets produce electricity? • A generator is a device that creates electric current by spinning an electric coil between the poles of a magnet. How can magnets produce electricity? Electric Generator Magnetic Levitation • Magnetic levitation is the lifting of an object by means of magnetic forces. • Scientists and engineers have designed trains that use magnetic levitation to travel on a track. • By aligning the right type of poles in the track and in the train, electromagnets push the train a few centimeters above the track. Magnetic Levitation • By switching the poles back and forth the magnetism is able to move the train forward. Magnetic Levitation