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Magnets - BAschools.org
Magnets - BAschools.org

... What do they look like? • An electromagnets can be made out of a variety of materials but they all have the following: • Voltage source (battery or other source) • A ferromagnetic core • Wire wrapped around the core. This is known as a solenoid. ...
File
File

PHYSICS – Motor and Generators Section I
PHYSICS – Motor and Generators Section I

... density (lines per unit area) and the surface area. [NOTE]- Magnetic field strength is actually a vector (as can be seen with the vector notation). The “lines through an area” definition gives only the magnitude not the direction, which is what the above formula shows. Describe generated potential d ...
Electricity Review Questions
Electricity Review Questions

Electromagnets
Electromagnets

... The strength of an electromagnet increases as more coils of wire are wrapped around its magnetic core. The wire cant just be any wire, though, It has to be an insulated conductive wire. This means that the wire itself is made of a metal that conducts electricity, but the outside of the wire is wrapp ...
L15 Electromagnetic induction and inductance
L15 Electromagnetic induction and inductance

... each slip ring half way through each cycle ("commutator") ...
Lecture 23 ppt
Lecture 23 ppt

Chapter 8. Maxwell`s equations and vector calculus
Chapter 8. Maxwell`s equations and vector calculus

Generators and Motors
Generators and Motors

Lecture 21 pdf
Lecture 21 pdf

12.4 Solenoids
12.4 Solenoids

... sound effects in surround-sound systems. To produce sound you have to create longitudinal vibrations in the air, with compressions and rarefactions. The subwoofer has a cone made from paper or plastic that quickly moves outward to cause a compression and then quickly moves inward to cause a rarefact ...
Motional EMF
Motional EMF

Active course file - College of DuPage
Active course file - College of DuPage

... Upon successful completion of the course the student should be able to do the following: 1. Calculate the forces on static electrical charges using Coulomb's law 2. Calculate the strengths of electrical fields using Gauss' law 3. Calculate the capacitance of and the energy stored in an electrical ca ...
Electricity and Magnetism
Electricity and Magnetism

expansion phase
expansion phase

... • Eventually the balance of forces in the plasma sheet changes and the X-line begins to move tailward. • Earthward of the X-line the plasma sheet thickens and strong earthward flows are observed. • As the X-line moves toward its distant location, the currents and aurora begin to die at the lower edg ...
Physics Chapter 2: Key words to understand
Physics Chapter 2: Key words to understand

7TH CLASSES PHYSICS DAILY PLAN
7TH CLASSES PHYSICS DAILY PLAN

What is a Magnet?
What is a Magnet?

... towards ...
magnetic field - Broadneck High School Physics Web Site
magnetic field - Broadneck High School Physics Web Site

Electric and magnetic forces in everyday life
Electric and magnetic forces in everyday life

... An industrial application of magnetic force is an electromagnetic crane that is used for lifting metal objects. ...
NOT
NOT

... Lesson 2: How do electric circuits work?? ____________________ a circuit that connects several objects one after another so that the current flows in a single path. ____________________ a circuit that connects several objects in a way that the current for each object has its own path. ...
Magnets and electricity - Rm. E
Magnets and electricity - Rm. E

PHY2054_f11-10
PHY2054_f11-10

... in the opposite direction to the field inside the solenoid ...
`magnetic field`.
`magnetic field`.

... magnetic field. When it passes through the field, it experiences a 8.0 x 10-14 N push to the west. If a northward-moving proton experiences 0 N, a) In what direction is the magnetic field in this area? b) How strong is the field in this area? ...
Presentation 1
Presentation 1

... Scalar and Vector Fields Scalar Field example: A pan on the stove being heated. Temperature at different points of the pan is a scalar field Vector Field example: Water flowing through a canal. Velocity highest at middle, zero at the edges ...
< 1 ... 73 74 75 76 77 78 79 80 81 ... 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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