Tag: Magnetic Field
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Oersted (Unit)
Introduction The Oersted (Oe) is a unit of magnetic field strength in the centimeter-gram-second (CGS) system of units. Named after the Danish physicist Hans Christian Ørsted, this unit has been widely used in the field of magnetism. Definition and Measurement Magnetic Field Strength Magnetic field strength, also known as magnetic field intensity, is a measure…
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Larmor Precession
Introduction Larmor precession is a phenomenon observed in quantum mechanics, where the spin (or magnetic moment) of a particle precesses around an external magnetic field. This principle is fundamental to technologies like magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) spectroscopy. Basic Principle of Larmor Precession A magnetic moment in an external magnetic field…
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Chapter 19: Ampere’s Law
19.1 Introduction In this chapter, we will introduce Ampere’s law, which relates the magnetic field around a closed loop to the total electric current passing through the loop. Ampere’s law is an essential tool for calculating the magnetic fields generated by steady currents in wires and other conductive materials. 19.2 Ampere’s Law Ampere’s law states…
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Poynting Vector
Introduction The Poynting vector is a fundamental concept in electromagnetism representing the directional energy flux density (the rate of energy transfer per unit area, in Watts per square meter) of an electromagnetic field. It is named after its inventor, the physicist John Henry Poynting. Definition the Poynting Vector The Poynting vector is defined as the…
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Chapter 18: The Magnetic Field of a Moving Charge
18.1 Introduction In this chapter, we will discuss the magnetic field produced by moving charges, such as electrons and ions, and how it affects the motion of other charged particles. Understanding the magnetic field of a moving charge is essential for various applications, including the design of particle accelerators and the analysis of plasma behavior…
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Chapter 16: Motion in Magnetic Fields
16.1 Introduction In this chapter, we will explore the motion of charged particles in magnetic fields. Understanding the behavior of particles in magnetic fields is important for various applications, including particle accelerators, magnetic confinement fusion, and magnetic resonance imaging. 16.2 Motion of Charged Particles in a Uniform Magnetic Field When a charged particle enters a…
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Chapter 15: Magnetism
15.1 Introduction to Magnetism In this chapter, we will explore the fundamental principles of magnetism, the forces experienced by charged particles in a magnetic field, and the origin of magnetic fields. Understanding magnetism is essential for various applications in physics, such as motors, generators, and transformers. 15.2 Magnetic Fields A magnetic field is a vector…
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Permeability of Free Space
Introduction The permeability of free space, often denoted as , is a physical constant that describes the amount of magnetic field produced per unit of magnetic current in a vacuum. It is one of the fundamental constants in physics and plays a vital role in the study of electromagnetism. Definition and Value The permeability of…
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Ginzburg-Landau Theory
Introduction The Ginzburg-Landau (GL) theory, named after physicists Vitaly Ginzburg and Lev Landau, is a phenomenological theory that describes superconductivity and superfluidity. It was originally developed to explain the behavior of superconductors near their critical temperature. Ginzburg-Landau Free Energy The GL theory is based on the concept of a complex order parameter , which characterizes…
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Babinet’s Principle
Introduction Babinet’s Principle, named after French physicist Jacques Babinet, is a theorem concerning diffraction in the field of optics. The principle states that the diffraction pattern from an opaque body is identical to the pattern from a hole of the same size and shape except for the overall forward beam intensity. Statement of Babinet’s Principle…