All Questions
Tagged with electric-fields dipole
116
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2
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Dipoles as vectors
A triatomic molecule $X_2Y$ has plane structure as shown in figure. Due to difference in electronegativity, charge acquired by each X atom is $q$ and charge on Y atom is $- 2q$. The bond length ...
- 89
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63
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Potential of an electric dipole
I'm currently working my way through Griffith's Introduction to Electrodynamics (4th ed).
In chapter 3 section 4, he shows that we can take the equation for the electric potential of a continuous ...
2
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2
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378
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Dielectric and dipole
When a molecule of a dielectric material is placed in an electric field, the molecule acquires an electric dipole moment. Why?
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17
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Time average of product of 2 function with same frequency
Hi I'm Reading a notebook on "light atom interactions"
There is this calculation I don't understand of average power -
$$P=\overline{-\boldsymbol{E} \cdot \frac{\mathrm{d} D}{\mathrm{~d} t}}=...
2
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0
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57
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Do neutral atoms have an electric field? [duplicate]
The charge of an atom is the sum of its nuclear charges (protons and electrons). If a atom is neutral, does it mean it does not have an net electric field?
I thought about this a lot, here is some of ...
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67
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What's the Lagrangian of an electric dipole in an external electric field?
I took electromagnetism a while ago, but now that I took Lagrangian and Hamiltonian mechanics, this question came up to me when I imagined an electric dipole in the presence of a uniform electric ...
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How did the scientist measure the dielectric constant? Does the dielectric constant relate to an alignment with the electric field?
I heard that the dielectric constant of water is around 78. When we think about the way we get the $\kappa$ of water,
Can we get the $\kappa_{water}$ by putting the water molecules on the $\vec{E}_{...
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-1
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3
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78
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Why can't the two charges in an electric dipole exist independently in an uniform electric field?
Why can't the two charges in an electric dipole exist independently in an uniform electric field? What I mean is, why should they behave as if they are connected together by a rod between them? What ...
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Potential energy of an electric dipole without any external field
What is potential energy of an electric dipole without any external field?
If its 0 then why? Wouldn't the charges get attracted thus do work so they must have some potential energy.
- 367
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2
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70
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$\vec{E}$-field in toroidal polarized dielectric
In an electrostatic situation, imagine a dielectric torus that is permanently polarized with polarization given by:
$\vec{P} = P(r, z) \hat{\phi}$
(Here cylindrical coordinates are used with the $z$-...
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3
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2
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639
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Dipole approximation
I am studying the "dipole approximation" as is defined in quantum optics. (See, for example Introductory Quantum Optics by Gerry and Knight, pages 24–25.) In this situation, we have the ...
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98
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In Maxwell's equations concerning dielectric materials , does the electric field represent the external electric field or the net electric field?
Let's assume we have dielectric material and we apply an external electric field that acts on it (let's call it Ex ) . As a resault we get dipoles who in turn create another electric field (let's call ...
- 329
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64
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Electric Field Lines - Why do we draw such lines for dipole?
In a dipole case (1 proton / 1 electron), we draw $E$ field lines such as they go and move into the negative charge. If we take an example point near negative charge's upside vertically, we see there ...
- 367
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1
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219
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How and why potential energy is stored in a dipole in uniform electric field?
I learnt that potential energy is stored in a dipole in uniform electric field when it is rotated from theta = pi/2 to any other theta, and the magnitude of stored potential energy can be found out by ...
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Electric field of dipole antenna
I have seen that the electric field of a dipole antenna detaches and propagates.
For a section of the detached electric field, will the antenna experience recoil if the detached field moves a charged ...
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