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Lesson 15 and 16
Lesson 15 and 16

For this relationship to be valid, the velocity must be perpendicular to
For this relationship to be valid, the velocity must be perpendicular to

A Brief Outline of the History of Electromagnetism
A Brief Outline of the History of Electromagnetism

Magnetic field - Southgate Schools
Magnetic field - Southgate Schools

... by chance in 1820. As he prepared for one of his classes, he noticed that when he turned on the electric current in a wire, a compass needle that was on another experiment changed its position. When the electric current was turned off, the compass needle returned to its original position. ...
Weekly Science Lesson Plans
Weekly Science Lesson Plans

... each group take turns using the magnets to pick up the different items inside their plastic bags. As a group they should decide what makes a material magnetic. ...
magnetism powerpoint
magnetism powerpoint

Electromagnetic Induction
Electromagnetic Induction

21.2 Electromagnetism
21.2 Electromagnetism

here
here

Section 2 notes--Electromagnetism
Section 2 notes--Electromagnetism

... Electric Motors • An electric motor is a device that changes electrical energy into mechanical energy Electric motors contain electromagnets that are free to rotate between the poles of a permanent, fixed magnet The coil in the electromagnet is connected to a source of electric current ...
Why do things move? - Utah State University
Why do things move? - Utah State University

PHY2105
PHY2105

... This course builds on the Electricity and Magnetism course offered at Level 1. It covers eelectrostatics, stationary electric fields in conducting media, magneto-static field laws, Maxwell’s equations and their applications. 5. Course Objectives At the end of the course, the student will be able to: ...
File
File

Faraday`s Law of Induction
Faraday`s Law of Induction

PHY2054_f11-10
PHY2054_f11-10

IB Physics III Review Sheet Unit 6B: Electromagnetism Students
IB Physics III Review Sheet Unit 6B: Electromagnetism Students

The World`s Simplest Motor
The World`s Simplest Motor

... magnetic field it creates is called Ampere’s Law and it states that the magnetic field is proportional to the current. Thus, one loop of wire, regardless of how big the wire is, will create roughly the same magnetic field as another wire, as long as the same size current runs through it. But, if the ...
Producing Electric Current
Producing Electric Current

06_lecture_ppt
06_lecture_ppt

... • Drift velocity of electrons slow • Electric field moves through at nearly light speed ...
A general rule for how a pickup coil will respond to a magnetic field
A general rule for how a pickup coil will respond to a magnetic field

PLATE TECTONICS Last time, we discussed the lithosphere, the
PLATE TECTONICS Last time, we discussed the lithosphere, the

ELECTRICITY AND MAGNETISM II
ELECTRICITY AND MAGNETISM II

... between the plates. Using this circle as your "Amperian loop", and the flat surface that spans it, find the magnetic field at a distance s from the axis. ...
6. Magnets and Motors
6. Magnets and Motors

... you can pick up. 6. Hook up two batteries in a series (one on top of the other) and see if this makes a difference with the amount of paper clips you can pick up. 7. Use arrows to draw the electric current moving through the wire from the positive terminal to the negative terminal. Questions ...
Lecture 7 Extra
Lecture 7 Extra

... • The electric permittivity of free space ε0 • the magnetic permeability of free space, μ0, taken to have the exact value Contains the force unit N for Newton and the unit A is the Ampere, the unit of electric current. With the magnetic permeability established, the electric permittivity takes the v ...
Faraday`s Law
Faraday`s Law

... (a) When the magnet is moved toward the stationary conducting loop, a current is induced in the direction shown. The magnetic field lines shown are those due to the bar magnet. (b) This induced current produces its own magnetic field directed to the left that counteracts the increasing external flux ...
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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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