All Questions
Tagged with electric-fields dipole
13
questions
14
votes
3
answers
7k
views
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 ...
- 165
6
votes
1
answer
563
views
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
9
votes
6
answers
8k
views
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
7
votes
3
answers
1k
views
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
4
votes
1
answer
12k
views
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
votes
1
answer
1k
views
Are the axial electric field lines of a dipole the only ones that extend to infinity?
Consider an electric dipole and its electric field lines.
There will be many field lines that do not extend to or originate from infinity, but rather begin at the positive charge and loop back ...
- 791
8
votes
4
answers
2k
views
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
5
answers
8k
views
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
2
votes
2
answers
5k
views
Minimizing potential energy of a dipole in an electric field
My test paper asked me which way a dipole should be orientated in an electric field to minimize its potential energy. My answer was that the dipole should lie parallel to the electric field with the ...
- 123
1
vote
1
answer
519
views
Potential of a dipole with actual physical extension?
I think everybody here knows the equation that gives the potential of a point like dipole, but how does the field look like if you have e.g. a metal sphere with radius $R$ and a certain dipol moment, ...
- 1,880
0
votes
1
answer
3k
views
Radial vs tangential component of electrical field due to dipole
I was wondering that why should the maximum magnitude (with respect to $\theta$) of radial component of electrical field of an electric dipole, $$E_r=-\partial V/\partial r=\frac{2p \cos\theta}{4\pi\...
- 245
0
votes
1
answer
245
views
Do neutrons in a strong electric field show a small dipole behaviour?
As neutrons are neutral an electric field should not attract or repel them. However, as they are composed of a positive and a negative part, called one 'up' and two 'down' quarks, shouldn't those ...
- 2,255
-2
votes
2
answers
1k
views
Electric field $E$ due to a dipole moment
Why is the formula of $$E = kp/z^3~ ?$$
Why is it $z^3$ ?
I want a physics answer not math please.
