All Questions
Tagged with electric-fields dipole
116
questions
14
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3
answers
7k
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Is there an electric field around neutral atoms?
Even if the atom is neutral (equal numbers of protons and electrons), the electrons and nucleus form an electrical dipole, so there is still an electric field around them, even though the total charge ...
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votes
6
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What is the origin of the Dirac delta term in the dipole electric field?
I am a bit lost how one has deduced the formula for electric field with electric dipole because of some inconsistency between different sources. The Wikipedia article contains a delta function in the ...
- 609
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votes
1
answer
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On Problem 2.2 in Griffiths' Introduction to Electrodynamics
In part (a) we were asked to find the electric field at a distance $z$ above the midpoint between two equal charges of magnitude $q$ that are a distance $d$ apart. I obtained the correct answer:
$$\...
- 1,638
8
votes
3
answers
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Electric field due to a hydrogen atom
Electric field due to two opposite charges
According to the answers in the previous questions,
if you separate the two charges from each other, they will produce a non-zero electric field ...
- 122
8
votes
4
answers
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Why does an atom in an oscillating electric field behave like an electric dipole?
How can I understand that an atom subjected to an oscillating electric field (e.g., $\vec{E}=\hat{i} E_0\cos\omega t$) behaves like an oscillating electric dipole? What is the underlying picture that ...
- 11.8k
7
votes
3
answers
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Does a AAA battery have a dipole moment?
Does a AAA or D battery have an electric dipole moment? Why don't the opposite poles of two batteries attract each other like that of magnet's?
- 151
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5
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Electric field falls off faster than $\frac{1}{r^2}$ for large distances
An excerpt from a book;
The electric field due to a charge configuration with total charge zero, is not zero; but for distances large compared to the size of the configuration, its field falls off ...
- 493
6
votes
1
answer
563
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Is there a finite-sized charge distribution whose electric field is *exactly* that of a point dipole?
This kinda gets lost in the telling when electric dipoles are introduced in textbooks, and it ends up causing a good deal of confusion (as in e.g. this recent example). Point electric dipoles, and the ...
- 134k
6
votes
1
answer
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Direct detection of the electric field of an electromagnetic wave from an oscillating dipole
The principle behind the detection of gravitational waves is that stellar-mass sources can act as coherent oscillators, producing a gravitational wave with a well defined, and relatively slowly ...
- 133k
4
votes
5
answers
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How does an electric dipole lose its energy while aligning with a uniform electric field?
How does an electric dipole lose its energy while aligning with a uniform electric field: through heat or light?
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1
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Force from point charge on perfect dipole
Have a point charge and a perfect dipole $\vec{p}$ a distance $r$ away. Angle between $\vec{p}$ and $\hat{r}$ is $\theta$. Want to find force on dipole.
I'm having more than a little difficulty ...
- 1,681
3
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6
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Why is electric field of dipole nonzero?
Why is the electric field from a dipole nonzero? Intuitively, I know there are electric field lines going from the positive to negative charge, so there should be an electric field.
But if I apply ...
user243050
3
votes
2
answers
660
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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 ...
3
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2
answers
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Does field line concept explain electric field due to dipole?
Consider an electric dipole consisting of charges $-q$ and $+q$, separated by a distance $2a$ and placed in free space. Let $P$ be point on the line joining the two charges (axial line) at a distance ...
- 5,819
3
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Motion of a dipole in an electric field
Assume that we have some non-constant electric field $E(x,t)$ and a point-dipole at a position $q$ with a constant dipole moment $\vec{p}$. How would you describe the time evolution, i.e. the motion ...
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