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The Magnetic Vector Potential
The Magnetic Vector Potential

... because of its analogous function to the electric scalar potential V ( r ) . An electric field can be determined by taking the gradient of the electric potential, just as the magnetic flux density can be determined by taking the curl of the magnetic potential: E ( r ) = −∇V ( r ) ...
Lecture 16
Lecture 16

5G50.52 Energy Storage with Superconductors
5G50.52 Energy Storage with Superconductors

... For a given temperature of superconductor, there are also other ”critical” values. One is the critical current density, Jc , the maximum current density that can be applied through a superconductor before it loses its superconducting properties. It is important to never apply a current greater than ...
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Electrostatics Practice Questions

Maxwell`s Equations, Part I: History
Maxwell`s Equations, Part I: History

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UNIT B - apel slice

... Actually, an electric current produces a magnetic field around a wire. You can't see the field, but it circles the wire. The field around a single wire is weak. The field around many wires close together is strong. When coils wrap around an iron core, such as a nail, the core becomes an electromagne ...
physics-p5-what-you-should
physics-p5-what-you-should

... I can recall that components (for example resistors, lamps, motors) resist the flow of charge through them I can recall that the larger the resistance in a given circuit, the smaller the current will be I can recall that the resistance of connecting wires is so small that it can usually be ignored I ...
PHYS 222 General Physics II - South Central College eCatalog
PHYS 222 General Physics II - South Central College eCatalog

... Explain magnetic force on a current-carrying wire. Describe torque on a current loop. Study magnetic dipole moment. Describe force between two parallel currents. Calculate the magnetic field due to a current. Study Ampere's Law. Characterize solenoids and toroids transformers. Analyze a current-carr ...
Charge to mass ratio of electron
Charge to mass ratio of electron

... applied, the electrons will begin to curve around in a helix. Rotate the tube so that the electrons are launched perpendicular to the field, and the path will become a circle. Explain in your report what the influence of the Earth's magnetic field is on your measurement, and how you could correct fo ...
1st lecture The Maxwell equations
1st lecture The Maxwell equations

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Introduction to Electrodynamics, 4th ed. by David Griffiths

... I1 = F dt = 12 µ0 σ 2 Av ŷ u dt = 21 dµ0 σ 2 Av ŷ. [The velocity of the patch (of area A) is actually v+u = v ŷ−u ẑ, but the y component produces a magnetic force in the z direction (a repulsion of the plates) which reduces their (electrical) attraction but does not deliver (horizontal) momentum ...
Science       SCI.IV.3.2  Grade:  2
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Mega avolts and Kil loamps s – The Life of fa Bolt t of

... charges repel each other and opposite charges attract  each other. If a positively charged object approaches  another object then the negative charges in the second  object are attracted to the positive object so that the  near side becomes negatively charged. At the same time only the positive char ...
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Quantum Mechanics_magnetic flux

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Fundamentals of magnetic field

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Ch7LectureSlides

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2 - UWO Physics

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Teaching Magnetism with Home

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Chapter 9 THE MAGNETIC FIELD

... Figure 3 Geometry for the magnetic field due to an infinitely long straight current. ...
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E_M_4_teachers

... the movement of the diaphragm since they are attached – this produces sound. The current must change in order to produce the movement. That is why the coil only moves when the circuit is closed or opened. A steadily flowing current is equivalent to a stationary magnet near a coil – no movement is pr ...
PowerPoint-Electromagnetic Induction File
PowerPoint-Electromagnetic Induction File

... As we saw with free electrons moving in a field, they experience a force as show in the diagram ...
conduction current
conduction current

talk-austin-07
talk-austin-07

Lecture 07: Current Flow - Purdue Physics
Lecture 07: Current Flow - Purdue Physics

force on a current in a magnetic field
force on a current in a magnetic field

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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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