Questions tagged [dielectric]

This tag is for questions relating to a non-conducting material called dielectric (or dielectric material). Dielectrics are very much important to explain various phenomena in various fields of physics like solid-state physics, optics, electronics, cell biophysics, etc.

Filter by
Sorted by
Tagged with
0 votes
1 answer
41 views

Problem 4.37 from Griffiths electrodynamics [closed]

The problem says : "A point dipole p is imbedded at the center of a sphere of linear dielectric material (with radius $R$ and dielectric constant k). Find the electric potential inside and ...
user avatar
0 votes
0 answers
19 views

What's the general rules of the relationship of permittivity of different materials?

As we know the real part of permittivity is dielectric constant $\varepsilon^{'}$, and the imaginary part of permittivity is dielectric loss $\varepsilon^{''}$. So are there general rules of the ...
user avatar
1 vote
0 answers
24 views

Laplace's equation in presence of a dipole

I know that in classical electrodynamics we're dealing with stuff macroscopically, so I can pretend that some volume of space is empty of charge when it's actually full of matter consisting of charged ...
user avatar
-1 votes
0 answers
15 views

Write the expression for $j$ in the case where the semiconductor has a scalar effective mass, along the $x$ axis there is a temperature gradiententer [closed]

Write the expression for $j$ in the case where the semiconductor has a scalar effective mass, along the $x$ axis there is a temperature gradiententer image description here
user avatar
0 votes
1 answer
63 views

Electric field along axis of polarized cylinder

Suppose a cylinder of radius $R$ and length $L$, with longitudinal polarization $\vec{P}=P(r)\hat{z}$, where $(r,\theta,z)$ are usual cylindrical coordinates. I want to compute the electric field $\...
user avatar
  • 496
0 votes
1 answer
30 views

Reduced electric field strength in a homogenous isotropic linear dielectric

Griffiths says that for the electrostatic field and electric displacement to work alike, the entire space needs to be filled with the meat of the dielectric, but I'm not sure what he means when saying ...
user avatar
1 vote
2 answers
35 views

Can a material be electrically polarized with electromagnetic radiation?

Is charge separation possible by bombardnment of electromagnetic radiation? As conventional dielectric materials can be polarized with a electric field, I am wondering if electromagnetic radiation, ...
user avatar
0 votes
0 answers
14 views

Phase shift of the annihilation operator when passing through a dielectric

Let's say there is a plane electromagnetic wave with annihilation operator $\hat a$. Why is it the case that when this beam passes through a transparent dielectric slab of some finite thickness, it ...
user avatar
  • 53
1 vote
0 answers
12 views

The time scale of charge accumulation or polarization by applied electric fields

When electric fields are applied to metal or dielectric, as a response, the charge accumulation (in metals) or the polarization (in dielectrics) is induced. I wonder how fast the response is complete. ...
user avatar
  • 31
0 votes
1 answer
17 views

Books on Dielectric mirrors

I'm looking for books that can introduce me to dielectric mirrors, as one of my professors wants me to join them on a project on the subject. Any recommendation is appreciated.
1 vote
1 answer
36 views

UV & IR radiation are mostly absorbed by water. Our eyes are predominantly water. If our eyes were made of another liquid, could we see slight UV/IR?

Firstly, I'm not a physics guy. I just think it's neat, that's all. I was reading a post on here about why water is transparent (I was more interested in why milk isn't) and saw a graph that showed ...
user avatar
0 votes
2 answers
116 views

Net bound surface charge density of capacitor

Q. In a parallel plate capacitor, two dielectric slabs of thickness 5 cm each are inserted between the plates and a potential of 100 V is applied across it. The value of the net bound surface charge ...
user avatar
  • 170
0 votes
1 answer
25 views

Does the current inside a capacitor with dielectric becomes zero, if a DC (constant)voltage is applied?

Imagine a capacitor with dielectric with conductivity $\sigma$ and constant voltage source with voltage applied say $V$ is applied to it's ends, now using Ohm's Law we have $ \vec{J} = \sigma \vec{E}$....
user avatar
0 votes
0 answers
11 views

Dielectric function of PFO

I have the graph of a dielectric function $ε(ω)=ε_1(ω)+iε_2(ω) .$ and ω is the photon energy in eV. I was wondering how can I fit the imaginary part of the dielectric function and in which program(e....
user avatar
  • 1
0 votes
0 answers
29 views

What is $Q$ in the energy stored in a parallel plate capacitor?

If we have a parallel plate capacitor like the one below the energy stored in it can be give by $$ U=\frac{Q^2}{2C}$$ $\bullet$ C is the capacitance of the capacitor Now is the $Q$ the free charge on ...
user avatar
0 votes
0 answers
11 views

Validity of defining Effective Permittivity in Dielectric Mixture

I am a optics-major student currently studying the topic of line-of-sight propagation of wave in scattering medium. I recently noticed some interesting articles about microwave propagation in mixtures,...
user avatar
  • 1
0 votes
1 answer
26 views

Conducting shell surronded by, dielectric shell, and an outside $q$ charge

I would like some help with my solution attempt. I have a conducting shell with radius $R1$, surronded by a dielectric shell with $\varepsilon_1$ and radius $R2$, and on the outside i have a $POINT$ $...
user avatar
0 votes
2 answers
24 views

Is there a similar process like hysteresis for dielectrics/dipoles?

Hysteresis is shown in the following image from hyperphysics: Does a similar curve exists for dipoles? For example given a dielectric medium inside a capacitor, the electric field will induce a ...
user avatar
  • 1,016
0 votes
2 answers
58 views

How to derive the Electric field from the magnetic field?

Given a linearly polarized, monochromatic plane wave with $H = H_0y^{cos(kz − ωt)}$ traveling in the $+\hat{z}$ direction that is incident on a dielectric sphere with permittivity $e$ and radius $a$, ...
user avatar
  • 11
0 votes
0 answers
12 views

Work and Dielectric Shell

Consider a dielectric shell with inner radius R1 and outer radius R2, if I were to carry a point charge q from infinity to the center of the shell, what is the total work done by me? This is the ...
user avatar
0 votes
2 answers
56 views

Static dielectric constant and optical dielectric constant

I was reading Introduction to Solid State Physics of Charles Kittel (8th Edition), and the static dielectric constant is defined as $$\epsilon(0) = \epsilon(\omega=0) $$ and the optical dielectric ...
user avatar
  • 342
0 votes
3 answers
35 views

Terminology: does this situation correspond to an anisotropic but linear dielectric?

Let us assume that for a dielectric the relation $${\vec D}=\epsilon\vec E$$ holds where $\epsilon$ is independent of $\vec E$. However, let $\epsilon$ is not a scalar number but a tensor (or a $3\...
user avatar
0 votes
1 answer
18 views

Understanding boundary conditions for spherically symmetric dielectrics in Electrodynamics

I'm looking for some help understanding the reading in Classical Electrodynamics, JD Jackson, Chapter 4.4, Boundary-Value Problems. They state the potential as equations 4.48 and 4.49 as the separable ...
user avatar
0 votes
2 answers
25 views

For unpolarized plane wave traveling normal incident from air to dielectric what are the reflection and transmission coefficients?

Given an unpolarized plane wave traveling in air and hitting a dielectric at normal incident what equations can be used to calculate the reflection and transmission coefficient? I know for a polarized ...
user avatar
  • 11
0 votes
1 answer
26 views

For the interface between two linear, isotropic, homogeneous dielectric materials with no free charge, does $E$ remain continuous?

The title basically says it all. Does the normal component of the electric field stay continuous across the interface of the two dielectrics? My intuition is that it would not stay the same as there ...
user avatar
  • 11
0 votes
1 answer
25 views

Capacitance of capcitor with complex dielectric material

How do I find capacitance of capacitor if we insert a material in capacitor that has a dielectric constant which depends on position inside a capacitor? For example two plates of capacitor filled with ...
user avatar
0 votes
1 answer
18 views

Difference between two electrostatic problems involving dielectric

Suppose i imerse a charge $q$ on a spherical dielectric $(\epsilon_R)$ (linear). I put such a charge at the origin, and i want to know the displacement vector, the electric field, etc inside the ...
user avatar
  • 461
0 votes
0 answers
9 views

Equivalent circuit for a lossy dielectric having non-zero volume charge density

So I was reading about the circuit diagram representation of a lossy dielectric, in which they considered that the dielectric had no charge in it. But suppose if a dielectric has a volume charge ...
user avatar
0 votes
0 answers
14 views

Using Variation of Energy for a Dielectric to define the Electric Field

I have been reading through Zangwill's Modern Electrodynamics on my own, and I am confused about something in section 6.7.1, concerning the variation of total energy $U$ of a dielectric in the ...
user avatar
2 votes
1 answer
35 views

Bounded charges density different from zero

From wikipedia, the electric displacement field is $\vec D=\epsilon_0 \vec E+ \vec P$ and it satisfies $\nabla \cdot D=\rho-\rho_b$ where $\rho_b$ is "the density of all those charges that are ...
user avatar
  • 1,444
0 votes
0 answers
26 views

Real and Imaginary part for particle polarisability

I am trying to determine the real and imaginary parts from the following equation for the polarisability of particles $\Lambda_{MG}(\lambda)$: $$\Lambda_{MG}(\lambda) = \frac{\epsilon(\lambda) - \...
user avatar
1 vote
1 answer
43 views

Electric displacement at the boundary of a dielectric and vaccum

At the boundary of an infinite linear dielectric with constant $\kappa$ and a vacuum, a charge q is placed. In order to calculate the electric displacement$(\mathbf{D})$ we can use Gauss's law for ...
user avatar
  • 195
0 votes
0 answers
22 views

Surface charge at the boundary between two dielectric

A point charge q sits at z = −d on the z-axis. Find the polarization charge density $σ_P$ induced on the plane z = 0 when the half-space z > 0 is filled with a medium with dielectric constant $K_R$ ...
user avatar
  • 461
0 votes
1 answer
29 views

Can you increase capacitance of capacitor by sandwiching a high dielectric constant material between two strong insulators?

My very limited research into dielectric materials has suggested that the higher the dielectric constant of a material, the less insulating it is. So why not just have some material with extremely ...
user avatar
  • 3
11 votes
1 answer
546 views

Why do oxides form amorphous films instead of crystalline films?

If I oxidize a metal at room temperature, say aluminum, why does it form an amorphous material instead of crystalline $\rm Al_2O_3$?
user avatar
  • 135
0 votes
1 answer
49 views

How can we generalize the definition a non-linear media?

According to the definition: Nonlinear media are dielectric materials whose polarization density changes nonlinearly if a strong field is applied to them. If the field is small the nonlinear terms ...
user avatar
  • 1,197
0 votes
0 answers
12 views

How to calculate Dielectric constant of paper oil mixed-insulation capacitor from temperature variations?

The question puzzles me a long time, as I try to figure out how to calculate total dielectric constant so as to derive content of water inside a capacitor. I have a paper-oil insulated capacitor, the ...
user avatar
1 vote
1 answer
21 views

Where can I find tables of the refractive index (real and complex part) or dielectric function as a function of frequency for different materials?

I need this information to do simulations for my master's thesis but I don't know if there is a bibliography or a repository on the internet with this information. They are simple materials, water, ...
0 votes
3 answers
57 views

Permittivity vs resistance of metals and skin depth

I'm asked to estimate the skin depth of copper at a certain frequency, but in deriving the equation for skin depth we basically need to assume $-\omega^2\varepsilon+j\omega\sigma\approx j\omega\sigma$,...
user avatar
0 votes
1 answer
75 views

Difference between $D$ and $E$ electric fields and how to prove their relation

My original question was how I could get from [$\Phi = \int \textbf{D} \cdot d\textbf{S}$] $\to$ [$\textbf{D} = \epsilon \textbf{E}$] using Gauss' Law ($\iint_{A} \textbf{E} \cdot d\textbf{A} = \Phi_{...
user avatar
5 votes
3 answers
775 views

What force creates electronegativity?

Electric charge is used to describe the behavior of electrons which seek to counterbalance the positive charge of protons. But I have read about other forces which also attract electrons to atoms, ...
user avatar
0 votes
0 answers
17 views

Permittivity tensor transformation from local to global coordinates

Let us suppose that an anisotropic material of a specific thickness forms a closed surface for which we know the parametric equations with respect to a global coordinate orthogonal system. On the ...
user avatar
0 votes
0 answers
23 views

Dielectric susceptibility and scattering intensity

I am currently reading a paper about Resonant Soft X-ray Scattering and they mentioned that the resultant scattering intensity can be found from the dielectric susceptibility of the thin film, with ...
user avatar
  • 1
0 votes
1 answer
26 views

When a dielectric is polarized due to an electric field does it get deformed?

I think the answer is yes. There is an equivalent bound surface and volume charge in the dielectric, therefore some forces exist locally. So this should also be the reason why some dielectrics will ...
user avatar
0 votes
1 answer
21 views

Finding potential difference for one side of a parallel plate capacitor with dielectrics in parallel [duplicate]

I'm doing some homework problems and there's a question that asks for the potential difference of the left side of a parallel plate capacitor that looks like this: ...
user avatar
  • 1
0 votes
0 answers
15 views

Understanding the relationship of displacement and electrical field of nonlinear material using fourier

**I posted this question first in math.stackexchange but was told it might be more suitable here. I have a general formula of $$D = P_0 + \epsilon_1 E + \epsilon_2 E^2 + \epsilon_3 E^3 + ...$$ with $D$...
user avatar
1 vote
0 answers
28 views

Calculate electric fields given a point charge and dielectric?

I am currently trying to understand how to calculate the electric fields in space if I have an infinite plane that serves as a dielectric and right above the plane I place a point charge Q. I have an ...
user avatar
2 votes
2 answers
39 views

Electrical Potential Energy in Field Quantities

The energy to assemble an object with volume charge $\rho_v$ and potential $V(\vec{R})$ is $$W_e = \frac{1}{2} \int_{v'} \rho_v V(\vec{R}) dv'.$$ By Gauss's law, and a vector identity we know $ \...
user avatar
1 vote
0 answers
39 views

Capacitors filled with parallel $n$ dielectrics

I'll be brief. In cases where we have a capacitor filled with an $n$-amount of different dielectrics, each and everyone one right next to the other, is it okay to re-think the problem as having n ...
user avatar
0 votes
1 answer
23 views

How large is the fusion plasma dielectric constant? Why does this mean radial current cannot exist in a tokamak?

I am reading this paper by Rosenbluth and Hinton (1996). In the second paragraph of the introduction, they say two things I don't understand: The first, is that they claim that the "plasma ...
user avatar
  • 555

1
2 3 4 5
16