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LAB COURSE: 255B Fall 2015
LAB COURSE: 255B Fall 2015

Charge
Charge

Theory of Magnetic Monopoles and Electric
Theory of Magnetic Monopoles and Electric

... ρm = -ρe. Furtherthe fields, it also implies that ~ ρe = ρ m and ~ more, Reality has abundant electric charges, but magnetic charges are very rare. Wonder Land, on the other hand, has a lot of magnetic charges but very few electric charges. But remember that magnetic (electric) charges in Wonder Lan ...
Electricity and Magnetism, Part 4 Rationale:
Electricity and Magnetism, Part 4 Rationale:

Electromagnetism: The Motor Lab Student Version
Electromagnetism: The Motor Lab Student Version

Germain ROUSSEAUX
Germain ROUSSEAUX

Activities, including background information and student sheets
Activities, including background information and student sheets

... particles, he was able to show how a magnetic field might induce a current. It was never Maxwell’s intention to suggest that the ether was physically composed of an array of whirling vortices and particles. His intention was to create an analogy to help him develop his understanding of electricity a ...
Electrostatics Power Point
Electrostatics Power Point

Introduction to Electrostatics
Introduction to Electrostatics

Dirac`s Conception of the Magnetic Monopole, and its Modern Avatars
Dirac`s Conception of the Magnetic Monopole, and its Modern Avatars

Electrostatic Simulation Questions
Electrostatic Simulation Questions

... 6. The equation for the force of attraction for gravity looks similar to coulomb’s law: Force= k*m 1*m2 / r2. the only difference is the constant k (smaller for gravity) and the use of masses (m 1,m2) instead of charges. Why are both laws called an Inverse Square Law? Which force can only attract ot ...
Lecture01: Introduction, Vectors, Scalar and Vector Fields
Lecture01: Introduction, Vectors, Scalar and Vector Fields

Evolution of the knowledge of electricity and
Evolution of the knowledge of electricity and

slides
slides

File - electro science club
File - electro science club

Energy flow and the speed of electric field in DC circuit
Energy flow and the speed of electric field in DC circuit

... as shown in the figure. There is a flow of energy into the wire all around. It is, of course, equal to the energy being lost in the wire in the form of heat. So our "crazy" theory says that the electrons are getting their energy to generate heat because of the energy flowing into the wire from the f ...
Magnetic Effects-2013
Magnetic Effects-2013

P3.3 - The John Warner School
P3.3 - The John Warner School

... some footage of this levitation and ask the students to explain the magic to see if they realise there is a scientific principle behind the mystery (electromagnets lifting a person wearing a magnetic under-suit). Identify the direction of the force using Fleming’s left-hand rule. (5 minutes) Motor d ...
Maxwell Eguations and Electromagnetic Waves
Maxwell Eguations and Electromagnetic Waves

File
File

... compared to the separation distance between them, then the value of the E is a constant, as shown by the equally spaced, parallel electric field lines. The equation to determine it is: E = 4kq/A A is area of one plate q is the magnitude of charge on each plate ...
Germain ROUSSEAUX.
Germain ROUSSEAUX.

electromagnetism guide
electromagnetism guide

... 98. Alternating current reverses or alternates its direction in a pattern. 99. Electric generators produce alternating currents that reverse direction 120 times every second. 100. But when devices such as batteries supply electrical current, they provide direct current derived from chemical energy. ...
The effect of radial acceleration on the electric and
The effect of radial acceleration on the electric and

Germain ROUSSEAUX
Germain ROUSSEAUX

Electric Field around a Metal Disk within a Microwave Resonator
Electric Field around a Metal Disk within a Microwave Resonator

< 1 ... 14 15 16 17 18 19 20 21 22 ... 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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