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chapter 23 electric field
chapter 23 electric field

... Electrical conductors are materials in which some of the electrons are free electrons that are not bound to atoms and can move relatively freely through the material; electrical insulators are materials in which all electrons are bound to atoms and cannot move freely through the material .When mater ...
国家杰出青年科学基金 申请书
国家杰出青年科学基金 申请书

Plane Waves and Wave Propagation
Plane Waves and Wave Propagation

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... the computer simulator model to observe what happens when a magnet was moved near other magnets that were free to rotate. The observations with the test tube and simulator might have suggested the following model for the inside of a nail: that it behaves as if it contains a large number of entities, ...
Ch 8 Magnetism and Its Uses: Section 1 Magnetism
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... Ch 8 Magnetism and Its Uses: Section 3 Producing Electric Current A. From mechanical to electrical energy 1. Electromagnetic induction—the production of an electric current by moving a loop of wire through a magnetic field or moving a magnet through a wire loop 2. Generator—a device that produces e ...
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B. dA - Rutgers Physics

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Tachyon Tube and Supertube

Circular Polarization and Nonreciprocal Propagation in Magnetic Media
Circular Polarization and Nonreciprocal Propagation in Magnetic Media

... shows that a linearly polarized plane wave propagating in free space consists of two equal but counter-rotating components of circular polarization. In magnetized media, these circular modes can be arranged to produce the nonreciprocal propagation effects that are the basic properties of isolator an ...
a. notes E283C1
a. notes E283C1

Magnetic Field in a Time-Dependent Capacitor
Magnetic Field in a Time-Dependent Capacitor

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Wave Propagation in Cylindrical Poroelastic Dry Bones 1 Introduction

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... 1. Two different lines cannot intersect each other. (Because if they do, there would be two directions for the electric field at the point of intersection.) 2. The lines are not closed. They either come out of positive charges, terminate at negative charges, or extend to infinity. 3. Regions where t ...
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Harmonic Parameterization by Electrostatics

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Magnetic quenching of time-reversed light in photorefractive diluted magnetic semiconductors

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Lecture Notes 16: Magnetic Vector Potential, A; B = Curl A, Magnetostatic Boundary Conditions

... i.e. A′ ( r ) = A ( r ) + A ( r ) = A ( r ) + Ao , which leaves the magnetic field B ( r ) unchanged. In general there are many instances involving more complicated physics situations, where B ( r ) ≠ constant vector field, where indeed B ( r ) = ∇ × A′ ( r ) and ∇i A′ ( r ) = 0 are simultaneously s ...
Lecture 16 - The Local Group
Lecture 16 - The Local Group

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... In general, poled piezoceramics (such as PZT-5A and PZT-5H) are transversely isotropic materials. To be in agreement with the IEEE Standard on Piezoelectricity [1], the plane of isotropy is defined here as the 12-plane (or the xy-plane). The piezoelectric material therefore exhibits symmetry about t ...
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Evidence for reversible control of magnetization in magnetic field

... is enhanced in materials where ferromagnetism is carriermediated4 , because in such materials the control of carrier polarization provides an alternative means for manipulating the orientation of magnetic domains. In some crystalline conductors, the charge current couples to the spins by means of in ...
Chapter 19 Electric Potential Energy and the Electric Potential
Chapter 19 Electric Potential Energy and the Electric Potential

... Conceptual Example 7  Where is the Potential Zero? Two point charges are fixed in place.  The positive charge is +2q and the negative charge is –q.  On the line that passes through the charges, how  many places are there at which the total potential is zero? ...
MRAM Technical Guide
MRAM Technical Guide

... to familiarize the reader with examples of these sources and the resultant magnetic field profiles. The first example is a straight wire carrying 200 Amps, such as a starter cable for an engine with a cross-section of 1.5 centimeters. As is shown in Table 1, the field’s magnitude decays rapidly with ...
11 - HCC Learning Web
11 - HCC Learning Web

... insulator. Because of the electrical attraction between the charged balloon and the neutral wall, the balloon sticks to the wall. Imagine now that we have two infinitely large, flat sheets of insulating material. One is charged, and the other is neutral. If these sheets are brought into contact, doe ...
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Maxwell's equations

Maxwell's equations are a set of partial differential equations that, together with the Lorentz force law, form the foundation of classical electrodynamics, classical optics, and electric circuits. These fields in turn underlie modern electrical and communications technologies. Maxwell's equations describe how electric and magnetic fields are generated and altered by each other and by charges and currents. They are named after the physicist and mathematician James Clerk Maxwell, who published an early form of those equations between 1861 and 1862.The equations have two major variants. The ""microscopic"" set of Maxwell's equations uses total charge and total current, including the complicated charges and currents in materials at the atomic scale; it has universal applicability but may be infeasible to calculate. The ""macroscopic"" set of Maxwell's equations defines two new auxiliary fields that describe large-scale behaviour without having to consider these atomic scale details, but it requires the use of parameters characterizing the electromagnetic properties of the relevant materials.The term ""Maxwell's equations"" is often used for other forms of Maxwell's equations. For example, space-time formulations are commonly used in high energy and gravitational physics. These formulations, defined on space-time rather than space and time separately, are manifestly compatible with special and general relativity. In quantum mechanics and analytical mechanics, versions of Maxwell's equations based on the electric and magnetic potentials are preferred.Since the mid-20th century, it has been understood that Maxwell's equations are not exact but are a classical field theory approximation to the more accurate and fundamental theory of quantum electrodynamics. In many situations, though, deviations from Maxwell's equations are immeasurably small. Exceptions include nonclassical light, photon-photon scattering, quantum optics, and many other phenomena related to photons or virtual photons.
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