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PHYS_3342_112211
PHYS_3342_112211

magnitize! - knomi.net
magnitize! - knomi.net

File - Physical Science
File - Physical Science

... magnets both with a north and a south pole!! ...
41B Magnetic Fields of Force - Merrillville Community School
41B Magnetic Fields of Force - Merrillville Community School

... causes them to be attracted to each other. Although magnetic fields only affect only some materials, they can create both attractive and repulsive forces that can be easily detected, observed, and measured. Common materials on earth that can be magnetic are made from the metallic elements iron, nick ...
Problem Set 8
Problem Set 8

A rail gun uses electromagnetic forces to accelerate a projectile to
A rail gun uses electromagnetic forces to accelerate a projectile to

Al-Balqa Applied University
Al-Balqa Applied University

Document
Document

PHYS2424 - SPRING 2000
PHYS2424 - SPRING 2000

... Write Maxwell's equations in the most general manner in differential form: ...
ELECTROMAGNETISM
ELECTROMAGNETISM

... At this stage, you understand roughly as much about the classification of interactions as physicists understood around the year 1800. There appear to be three fundamentally different types of interactions: gravitational, electrical, and magnetic. Many types of interactions that appear superficially ...
Word
Word

Magnets
Magnets

Force on a Current Carrying Wire
Force on a Current Carrying Wire

Magnetism and Electromagnetism
Magnetism and Electromagnetism

... atom produces a magnetic field • currents in wires will produce magnetic fields • The opposite is also true: moving magnetic fields will cause charges to move (electromagnetic induction) ...
Magnetism and Electromagnetism.pptx
Magnetism and Electromagnetism.pptx

... atom produces a magnetic field •  currents in wires will produce magnetic fields •  The opposite is also true: moving magnetic fields will cause charges to move (electromagnetic induction) ...
Electricity and Magnetism
Electricity and Magnetism

MAGNETS!! Properties of Magnets: A is any material that attracts
MAGNETS!! Properties of Magnets: A is any material that attracts

Magnetism I. Magnetic Forces Magnetism and electrostatic attraction
Magnetism I. Magnetic Forces Magnetism and electrostatic attraction

Word
Word

... dotted line the fields will cancel and there will be no net field. b. If the wires were free to move they would both rotate and settle along the diagonal with parallel currents. Any small movement which moves the wires away from being completely perpendicular will result in the wires being either at ...
File
File

... List as many facts about magnets as you can in your “Think About It” ...
What creates magnetic fields?
What creates magnetic fields?

Powerpoint Chapter 21 Magnetism
Powerpoint Chapter 21 Magnetism

... – Most of the time magnets are paired, and the fields cancel out – Magnetic domain – a region that has a large number of electrons with fields in the same direction – Magnetized – most of the domains are pointed in the same direction ...
File
File

Notes–Maxwell`s Equations
Notes–Maxwell`s Equations

... magnetic system. Mathematically denies the existence of a magnetic monopole. Relates induced electric field (voltage, induced current, etc.) to changing magnetic flux. The negative sign indicating direction of Emf opposes the change in Bflux. Notice also the definition of electric potential (V) on t ...
magnetic domain
magnetic domain

< 1 ... 97 98 99 100 101 102 103 104 105 ... 118 >

Eddy current

Eddy currents (also called Foucault currents) are circular electric currents induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. They can be induced within nearby stationary conductors by a time-varying magnetic field created by an AC electromagnet or transformer, for example, or by relative motion between a magnet and a nearby conductor. The magnitude of the current in a given loop is proportional to the strength of the magnetic field, the area of the loop, and the rate of change of flux, and inversely proportional to the resistivity of the material.By Lenz's law, an eddy current creates a magnetic field that opposes the magnetic field that created it, and thus eddy currents react back on the source of the magnetic field. For example, a nearby conductive surface will exert a drag force on a moving magnet that opposes its motion, due to eddy currents induced in the surface by the moving magnetic field. This effect is employed in eddy current brakes which are used to stop rotating power tools quickly when they are turned off. The current flowing through the resistance of the conductor also dissipates energy as heat in the material. Thus eddy currents are a source of energy loss in alternating current (AC) inductors, transformers, electric motors and generators, and other AC machinery, requiring special construction such as laminated magnetic cores to minimize them. Eddy currents are also used to heat objects in induction heating furnaces and equipment, and to detect cracks and flaws in metal parts using eddy-current testing instruments.
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