# Questions tagged [dipole-moment]

Dipole moment is the electrostatic moment generated by two opposite charges taken together, far away from the charge's locations

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### What is the significance of the Dipole moment in electrostatics? No one simply multiplies the distance between charges and the magnitude of charges

What is the significance of the Dipole moment in electrostatics? No one simply multiplies the distance between charges and the magnitude of the charge without a reason
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### Is there an analogous potential for magnetic moments in comparison to that of electric dipoles: $\frac{k \vec{p}\cdot \hat r}{r^2}$?

If I am not mistaken the electric potential of an electric dipole is given by: $$V(r) = \frac{k | \vec{p}|\cos \theta}{r^2} = \frac{k \vec{p}\cdot \hat r}{r^2}$$ Where $\vec{p}$ is the electric ...
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### Force between two dipoles [closed]

I am extremelly confused with this question: Basically suppose we have two electric dipoles, parallel to each other, as follows in the figure: I am supposed to show that the force is attractive and ...
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### 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 ...
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### Gravitatinal Dipole moments?

So, I was reading about electric dipoles, which is a system of positive and negative charges kept at a distance $d$. But I got an ideas, as to why there seems to be a lot of example of electric ...
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### If the dipole moment is not unique, how can the probability of absorption depend on the angle between the dipole moment and the electric-field?

For systems with non-zero net charge, the dipole moment depends on the choice of origin (see Does the dipole moment depend on the choice of origin?). How then, can the probability of emission/...
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### What do these energy level diagrams and notation mean in this Buckminsterfullerene dipole transitions question?

I have some questions about the authors' solution to the following homework style question: $C_{60}$ fullerene molecule question" /> I have added the number of electrons per level into the image, the ...
1 vote
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### How can the value of charge on an atom be less than that of a proton?

The dipole moment of an $\text{HCl}$ molecule is about $3.6×10^{-30} \ \mathrm{Cm}$ and the separation between the atoms of it is about $1.27×10^{-10}\ \mathrm m$. We know that dipole moment, $p=qd$. ...
1 vote
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### Electric dipole moment of a ring of charge [closed]

In my book dipole moment is defined for two charges. But I got a hw question to calculate dipole moment due to a ring. I tried two different methods to solve this problem but I don't think that any ...
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### Force on a dipole due to another dipole

The force on a dipole (with moment $\vec{p}_1$) in an electric field is given as $\vec{F} = (\vec{p}_1\cdot\vec{\nabla})\vec{E}$ Now lets say we have another dipole with moment $\vec{p}_2$ at the ...
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### Polarization density

Is the polarization density term in the electromagnetic wave equation the density of static electric dipole moments or transition dipole moments?
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### Transition Dipole Moment Function

A simple question: I have came across the word "transition dipole moment function" many times. I have seen it in Einstein coefficient relation or also called transition rates. In this ...
1 vote
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### Dielectric constant of crystals: Feynman's mistake?

Feynman mentioned in his lecture that we can, in some way, obtain dielectric constant of crystals by summing up the electric field due to dipoles. For example, equation (11.33) from above link shows ...
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### Behavior of a Pointlike Dipole

I have a practice problem in my textbook that I'm not sure how to approach. It asks to find the force of an electric field created by an infinitely long line of charge of density $+\lambda_0$ (which I ...
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### Is the dipole moment of a polarized particle supposed to be a constant?

Problem $4.4$ A point charge $q$ is situated a large distance $r$ from a neutral atom of polarizability $\alpha$. Find the force of attraction between them. Source: Griffiths, Electrodynamics ...
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### GUI for DFT calculations

I am a beginner in DFT. Can someone suggest a good DFT software with a GUI for simulating dipole moment directions and optical absorption spectra in an organic crystal? I have tried Burai. But it ...
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### If dipole moment is a vector $q×d$, then is charge a vector?

If I am right you can only do vector product for vectors. Here you have dipole moment $= q×d$. Then are we assuming charge is a vector? But how then does charge obey the triangle law of vector ...
1 vote
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### What is the physical significance of defining the dipole moment as a vector?

I don't know why do we need to assign a direction to some quantity which is a product of the charge and the distance bewteen charges. What is the physical reason of defining the dipole moment as a ...
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### Definition of electric polarisation and the potential due to a polarised body

I've two questions, the second one depends on the first. $\mathbf{1}$ How exactly is polarisation defined? Griffiths says $\mathbf{P} \equiv$ dipole moment per unit volume How exactly do we go about ...
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### Dipole moment of non-uniformly charged cylinder — direction

If we consider a cylinder along the $z$-axis, with charge density $\rho(z)$ [varying linearly according to$\rho = az + b$, from the positive value $\rho_1=-ha+b$] at $-h$ to the also positive \$\rho_2=...