All Questions
Tagged with electric-fields dipole
116
questions
8
votes
3
answers
4k
views
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
-4
votes
1
answer
95
views
What does $e$, $i$ and $\vec{p}$ mean in this formula? [closed]
I've found a formula to calculate the $\vec{E}$-field vector of a Hertzian dipole in the far field (don't know if that's the correct term) to draw and simulate the field lines.
Link to my source: ...
0
votes
2
answers
1k
views
Why is parallel dipole to electric field is stable equilbrium
For a dipole making $0$ degree angle with field and for making $180$ degrees it is stable and unstable equilibrium respectively. Why?
3
votes
1
answer
3k
views
Dipole Inside Cavity of A Spherical Conductor
Consider the following case:
There is a short electric dipole placed arbitrarily inside a spherical cavity inside a solid,uncharged conducting sphere
We need to find electric field at a point ...
- 257
0
votes
1
answer
87
views
Is there an electric field in a poled piezoelectric crystal at rest?
From my understanding, after a piezoelectric crystal is poled, all the dipoles are roughly aligned inside it, so that the piezoelectric effect is not negligible. However, wouldn't that result in a ...
- 25
2
votes
1
answer
122
views
Integrand discontinuity of surface integral of electric field of dielectrics
I am reading an article here on dielectrics
Equation $(4.10)$ is:
$$\Phi(\mathbf{r})=\dfrac{1}{4\pi \epsilon_0}\int_{V} \dfrac{d^3r'}{|\mathbf{r}-\mathbf{r'}|} [\rho (\mathbf{r'})\ -\nabla'.\mathbf{...
- 31
0
votes
1
answer
662
views
Approximation to the dipole of 2 infinite line charges
This is the question:
2 infinite line charges are located at distance $l$ and charged with linear charge density $\lambda $ and $-\lambda$. Find the electric field and the electric potential away ...
1
vote
1
answer
530
views
Spherical wavefronts from a linear electric dipole-antenna
We are given the equation
\begin{equation*}
\vec{E}=\hat{u}_\theta\ p_0 \sin{(\theta)}\frac{k^2}{4\pi\varepsilon_0r}\sin{(kr-\omega t)}~,
\end{equation*}
that describes the far field radiated ...
1
vote
2
answers
178
views
Electric field and potential [duplicate]
Suppose we consider a point dipole i.e. an ideal dipole. At the origin the potential:
$$ \phi(\mathbf r) = \frac{1}{4\pi\epsilon_0} \frac{\mathbf p\cdot\hat{\mathbf r}}{r^2}$$
is undefined due to ...
- 163
1
vote
1
answer
2k
views
Torque on dipole in a non-uniform electric field [duplicate]
What happens when an electric dipole is kept in a nonuniform electric field?
0
votes
1
answer
3k
views
Radial vs tangential component of electrical field due to dipole
I was wondering that why should the maximum magnitude (with respect to $\theta$) of radial component of electrical field of an electric dipole, $$E_r=-\partial V/\partial r=\frac{2p \cos\theta}{4\pi\...
- 245
0
votes
0
answers
56
views
Paradox in conservation of energy
Let us assume there is a constant electric field in an interested region (finite volume)and a non-conducting object is thrown into it with speed $v$ and now take the second scenario with the same ...
- 135
0
votes
1
answer
231
views
Why does a ionic crystal polarize more at low frequencies rather than at high ones?
And if there was a difference if the propagational mode of the electric field in the crystal is longitudinal or transverse.
- 222
0
votes
2
answers
251
views
Question about Optical tweezers working principle
Why do particles on the periphery of the laser beam in optical tweezers apparatus drift to the center of the beam? What force pattern causes this pull to the center?
- 107
0
votes
1
answer
49
views
What is the mechanism by which light induce polarity in tiny particles?
I understand that the electric field in light induces polarity in tiny microparticles for example. Can someone explain the mechanism of how the vibrating electric field in light induces a dipole ...
- 107