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Magnetism and electromagnetism worksheet
Magnetism and electromagnetism worksheet

... 9. You have two bars of metal of equal sizes, one is iron and the other one is steel. Which one would you use to make a permanent magnet and why? ...
For the test over magnetism, you should know:
For the test over magnetism, you should know:

Stronger at the poles
Stronger at the poles

... Flow from negative to positive ...
solenoid
solenoid

20.3 Motional emf
20.3 Motional emf

Physics Magnets and electromagnets revision
Physics Magnets and electromagnets revision

... • The field pattern around an electromagnet is the same as that around a bar magnet, as shown below ...
Magnetic Effects of Electric Currents
Magnetic Effects of Electric Currents

Chapter 15 Lesson 2 How are Electricity and Magnetism Related
Chapter 15 Lesson 2 How are Electricity and Magnetism Related

... Magnets have the strongest force at the poles A free swinging magnet will point north with its north seeking pole-that end is marked with an N. Like electrical charges, opposite forces between magnetic poles attract, N-S, positive –negative Like poles repel: south repels south; north repels north Ma ...
Lecture 5
Lecture 5

... single loop or wire is such that the loop will behave like a magnet or compass needle and swing until it is perpendicular to a line running from the north magnetic pole to the south. The magnetic field about a current-carrying conductor can be visualized as encircling the conductor. The direction of ...
Induction AP/IB
Induction AP/IB

... • When an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it. • The induced magnetic field inside any loop of wire always acts to keep the magnetic flux ...
Permanent Magnet & Electromagnet Principles
Permanent Magnet & Electromagnet Principles

Unit 6 Magnetism
Unit 6 Magnetism

3 Generators, Motors, Eddy Currents, Maxwell`s Four Equations
3 Generators, Motors, Eddy Currents, Maxwell`s Four Equations

SUMMARY 1. Define motor and generator. A motor is a device
SUMMARY 1. Define motor and generator. A motor is a device

... A motor is a device which converts electrical energy to mechanical energy (or motion). A generator is a device which converts mechanical energy into electrical energy. 2. What does the term “magnetic field” describe? The region surrounding a magnet where magnetic effects can be detected. A compass n ...
CHAPTER 3 QUIZ – ELECTROMAGNETISM
CHAPTER 3 QUIZ – ELECTROMAGNETISM

Magnets and Electricity
Magnets and Electricity

...  size of the iron core  Bigger core = stronger ...
Magnets and Electricity
Magnets and Electricity

Electromagnetism Cloze - Science
Electromagnetism Cloze - Science

... called a _________________. A _________________ power plant, for example, uses the energy of flowing water to generate electricity. As water flows from a high place to a low place, it pushes on _________________ blades causing them to spin. Coils of wire are attached to the spinning turbine and plac ...
Midterm Exam No. 02 (Spring 2015) PHYS 520B: Electromagnetic Theory
Midterm Exam No. 02 (Spring 2015) PHYS 520B: Electromagnetic Theory

Moving Charges and Magnetism
Moving Charges and Magnetism

docx: Geo Magnetic Journal
docx: Geo Magnetic Journal

... 9. What analogy can you make between the magnet you created and the Earth’s magnetic field? In other words, draw connections between features of your magnet and the features of the Earth’s magnetic field. ...
10.4 PPT Magnetism from Electricity
10.4 PPT Magnetism from Electricity

Magnetic Induction
Magnetic Induction

Document
Document

Chaper 21 flashcards
Chaper 21 flashcards

... 11) To increase the voltage in a coil, you move the magnet inside the coil of wire (slower, more rapidly, stationary) 12) The process of generating an electric current by moving an electrical conductor relative to a magnetic field is called electromagnetic (contact, friction, induction) 13) Mechanic ...
< 1 ... 110 111 112 113 114 115 116 117 >

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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