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Faraday`s Law - Rutgers Physics
Faraday`s Law - Rutgers Physics

... and the current was constant (except when you varied it to see how the force changed). So both magnetic fields were unchanged, resulting in a constant force between wire and magnet. In this lab, we will examine the consequences and applications of wires and magnets in the presence of a changing magn ...
Unpacking Outcomes - NESD Curriculum Corner
Unpacking Outcomes - NESD Curriculum Corner

Chapter 19 Magnetism and Electromagnetism
Chapter 19 Magnetism and Electromagnetism

Classifying Matter and the Periodic Table
Classifying Matter and the Periodic Table

... An electric motor. The simplest motors work by placing an electromagnet that can rotate between two permanent magnets. (a) When the current is turned on, the north and south poles of the electromagnet are attracted to the south and north poles of the permanent magnets. (b)–(d) As the electromagnet r ...
Magnets
Magnets

... Magnets can be used to make some things move without touching them. An example of this is the Bullet Train, which uses repelling magnets on the train and the track to move at high speeds without ever touching the train track! All magnets have an invisible magnetic force field that can be seen when a ...
Terrain Conductivity/Resistivity Applications
Terrain Conductivity/Resistivity Applications

Maxwell`s equations
Maxwell`s equations

... changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc. ...
Homework Set #3 - Solutions
Homework Set #3 - Solutions

... opposes the change in magnetic flux through the area enclosed by the loop. It is closely related to conservation of energy. Question 2 (3 points) A circular coil of wire with 350 turns and a radius of 7.5 cm is placed horizontally on a table. A uniform magnetic field pointing directly up is slowly t ...
Biot-Savart Law
Biot-Savart Law

magnetCh. 8 Magnetism
magnetCh. 8 Magnetism

Magnets- a body having the property of attracting iron and
Magnets- a body having the property of attracting iron and

3-d computer aided simulation
3-d computer aided simulation

Maxwell`s equations
Maxwell`s equations

... (with Maxwell's addition) Faraday's law of induction (Maxwell–Faraday equation) ...
Faraday`s law of induction states that changing magnetic field
Faraday`s law of induction states that changing magnetic field

6. Magnetism
6. Magnetism

... Ferromagnetism Ferromagnetic material contains “domains” 1 mm in length and normally random in direction Each acts like tiny magnet Generally, domains cancel – no magnetic effects An external field aligns domains (non-random) A strong magnetic field can make other ferromagnetic materials into perma ...
PHY 204: Electricity and Magnetism - Physlab
PHY 204: Electricity and Magnetism - Physlab

charging by - Mrs. Wiedeman
charging by - Mrs. Wiedeman

Chapter 17-18 Electricity and Magnetism
Chapter 17-18 Electricity and Magnetism

(magnetic fields and forces) (PPT - 5.9MB)
(magnetic fields and forces) (PPT - 5.9MB)

... A galvanometer is a type of an electric current meter. It is an analog electromechanical transducer that produces a rotary deflection of some type of pointer in response to electric current flowing through its coil. Ampere invented the galvanometer. Schweigger used a coil (1821). Nobili improved on ...
Electricity and Magnetism
Electricity and Magnetism

Observations of electricity go back to the discovery of static cling
Observations of electricity go back to the discovery of static cling

Chapter 10 Magnets Notes
Chapter 10 Magnets Notes

Effects of Electric Current * Learning Outcomes
Effects of Electric Current * Learning Outcomes

... Effects of Electric Current – Learning Outcomes  Explain the heating, chemical, and magnetic effects.  State Joule’s Law.  Demonstrate each effect. ...
Component Parts of a Dynamo
Component Parts of a Dynamo

document
document

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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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