- published: 11 Dec 2012
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The relative permittivity of a material is its dielectric permittivity expressed as a ratio relative to the permittivity of vacuum.
Permittivity is a material property that affects the Coulomb force between two point charges in the material. Relative permittivity is the factor by which the electric field between the charges is decreased relative to vacuum.
Likewise, relative permittivity is the ratio of the capacitance of a capacitor using that material as a dielectric, compared to a similar capacitor that has vacuum as its dielectric. Relative permittivity is also commonly known as dielectric constant, a term deprecated in physics and engineering, but one which is still commonly used in chemistry.
Relative permittivity is typically denoted as εr(ω) (sometimes κ or K) and is defined as
where ε(ω) is the complex frequency-dependent absolute permittivity of the material, and ε0 is the vacuum permittivity.
Relative permittivity is a dimensionless number that is in general complex-valued; its real and imaginary parts are denoted as:
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Donate here: http://www.aklectures.com/donate.php Website video: http://www.aklectures.com/lecture/dielectrics-and-dielectric-constant Facebook link: https://www.facebook.com/aklectures Website link: http://www.aklectures.com
How dielectrics function in circuits. By David Santo Pietro. Created by David SantoPietro. Watch the next lesson: https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnets-magnetic/v/introduction-to-magnetism?utm_source=YT&utm;_medium=Desc&utm;_campaign=physics Missed the previous lesson? https://www.khanacademy.org/science/physics/circuits-topic/circuits-with-capacitors/v/capacitors-parallel?utm_source=YT&utm;_medium=Desc&utm;_campaign=physics Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid unders...
Complete set of Video Lessons and Notes available only at http://www.studyyaar.com/index.php/module/87-dielectrics Learn about Dielectric Constant and Permittivity, Dipole Moment, Induced Dipole, Polarization Density, Dielectric Susceptibility, Types of Polarization, Electronic Polarization, Ionic Polarization, Orientational Polarization, Space charge Polarization, Interfacial Polarization http://www.studyyaar.com/index.php/module-video/watch/296-dielectrics-basic-concepts
Determination of Dielectric Constant for a Given Material Please watch edited video on https://www.youtube.com/watch?v=IUYXBCBUYO8 Read More : http://www.uniwip.com/tutorials/3/materials-science-practical-experiments/10/determination-of-dielectric-constant-for-a-given-material For more tutorials visit http://www.uniwip.com
Parallel Plate Capacitor & Dielectric Constant Experiment by Mohamed Sabet , Assiut University, Faculty of Science, Physics Dept. Explaining the theoretical basics and the experimental procedure.
There are a number of test methods to determine the dielectric constant of circuit materials used in the microwave or high frequency industry. Learn about the most common test methods like Clamped Stripline Resonator Test, Split Post Dielectric Resonator, Full Sheet Resonance (FSR), and Microstrip Differential Phase Length Method in this video.
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Introducing 3 new constants that apply only in linear dielectrics. Next: https://www.youtube.com/watch?v=_i44vArH9VA&list;=PLDDEED00333C1C30E Previous: https://www.youtube.com/watch?v=3TECt96mjtc&list;=PLDDEED00333C1C30E Playlist: https://www.youtube.com/playlist?list=PLDDEED00333C1C30E
Optics 4th/5th Edition Problem 3-49 Eugene Hecht (a) The dielectric constant of ice measured at microwave frequencies is roughly 1, whereas that for water is about 80 times greater- why? (b) How is it that a radar beam easily passes through ice but is con- siderably reflected when encountering a dense rain?
Experiment performed by Dept. of Physics, SASTRA University,Thanjavur. Feel free to Subscribe and please do hit the thumbs up button.
Concepts covered: Capacitance Parallel-Plate Capacitors The Dielectric Constant The Electric Field Vector
John Coonrod,Technical Marketing Manager, Rogers Corporation, Advanced Connectivity Solutions, www.rogerscorp.com/ACS This webinar addresses all issues associated with design Dk, give examples with measured data, discuss the test method used to determine design Dk and give direction as to where to find the design Dk data for Rogers Corporation’s high frequency circuit materials. Topics addressed: - Overview of frequency dependent dielectric constant - Anisotropy - Copper surface roughness effects - Thickness dependencies - Design Dk examples - Where to find design Dk information Learn more at Rogers ACS Technology Support Hub: https://www.rogerscorp.com/acs/technology/index.aspx
note: all videos are just for educational purposes
A spherical capacitor of two concentric conducting shells is divided into two halves, in which the space between the shells is filled with a dielectric of a specific dielectric constant. Calculate the electric and displacement fields in each half, as well as the capacitance of the entire capacitor.
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Polarization - Dielectrics - The Van de Graaff - More on Capacitors This lecture is part of 8.02 Physics II: Electricity and Magnetism, as taught in Spring 2002 by Dr. Walter Lewin at MIT. This video was formerly hosted on the YouTube channel MIT OpenCourseWare. This version was downloaded from the Internet Archive, at https://archive.org/details/MIT8.02S02/. Attribution: MIT OpenCourseWare License: Creative Commons BY-NC-SA 3.0 US To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/us/. More information at http://ocw.mit.edu/terms/. This YouTube channel is independently operated. It is not affiliated with MIT, MIT OpenCourseWare, the Internet Archive, or Dr. Lewin, nor do they endorse any content on this channel.
Microwave circuit designers have many powerful tools. However most are strongly dependent on the accuracy of the input data. High frequency printed circuit board (PCB) material properties are often assumed to be very simple, but understanding the details can increase model accuracy and minimize design time. Those familiar with high frequency behavior of circuit materials realize the term for relative permittivity of “dielectric constant” is a misnomer and is not a constant. The dielectric constant of any PCB material will vary with frequency. Additionally wave propagation properties can be altered by a relationship of substrate thickness to copper surface roughness and this can vary the dielectric constant as perceived by circuit performance, even when using homogenous material. This we...
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This video includes (Chapter - Electrostatic) Coulomb's Law in Vector Form, Dielectric Constant, Force between Multiple Charges, Superposition Principle for Class XII . Language: Hindi and English.
A dielectric material (dielectric for short) is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization. Because of dielectric polarization, positive charges are displaced toward the field and negative charges shift in the opposite direction. This creates an internal electric field that reduces the overall field within the dielectric itself. If a dielectric is composed of weakly bonded molecules, those molecules not only become polarized, but also reorient so that their symmetry axis aligns to the field. The study of dielectric properties concerns st...