Library — E
This page provides access to all physics articles covering topics that begin with the letter E.
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Eddy Current
Eddy currents are circulating loops of electric charge that appear inside conductors whenever they experience a changing magnetic environment. They arise from one of the most fundamental principles in electromagnetism—Faraday’s law of induction—which states that…
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Elasticity
Elasticity is a fundamental concept in physics that describes how materials respond when forces act upon them, deforming their shape or size. When an external force stretches, compresses, twists, or bends an object, the material…
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Electric Current
Electric Current stands as one of the cornerstone ideas in physics and electrical science, forming the very foundation of how we understand the movement of charges in conductive pathways and the mechanisms by which energy…
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Electric Charge
Electric Charge stands as one of the deepest principles in physics, shaping how matter interacts and how the visible universe holds itself together. At the heart of every atom, every current, and every spark of…
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Ehrenfest Theorem
Ehrenfest’s theorem is a foundational result in quantum mechanics showing how the average, or expectation, values of quantum observables evolve in time in a way that resembles classical mechanics. It forms a conceptual bridge between…
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Enthalpy
Enthalpy is a fundamental concept in thermodynamics, one of the most important branches of physics that deals with the relationships between heat, work, and energy in physical systems. It is a state function that helps…
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What is Entropy – Entropy
Entropy stands as a cornerstone of physics, encapsulating the measure of randomness or disorder within any physical system and governing the natural direction of physical processes. At its essence, entropy reflects how energy disperses or…
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Evanescent Field
The concept of the evanescent field occupies a central position in the study of wave phenomena, especially within optics, electromagnetism, and quantum mechanics. It describes a unique and fascinating behavior of electromagnetic waves at interfaces…
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Evanescent Wave
An evanescent wave is a fascinating and subtle phenomenon in physics that arises when a wave encounters a boundary or an interface in such a way that it cannot propagate through the second medium in…
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Electric Field
The concept of the Electric Field is one of the most fundamental and powerful ideas in physics, particularly in the study of electromagnetism. The Electric Field describes the influence that an electric charge exerts on…