# Questions tagged [dipole]

The tag has no usage guidance.

308 questions
Filter by
Sorted by
Tagged with
17 views

### What is the **electrostatic** potential energy of the dipole? [closed]

An electric dipole consisting of charges q and -q separated by a distance L is in stable equilibrium in a uniform electric field E. What is the electrostatic potential energy of the dipole? A)qLe B)...
51 views

### Electric field outside a conductor

Say there is a conducting cylinder in a uniform external field. The charges on the cylinder surface will distribute and create a surface charge density. Is there any reason the charge density would ...
34 views

### Dipole oscillators question from Feynman lectures 1.28-29

I am confused by the Feynman lectures Vol1Ch28-29. In all the pictures, there is an electric dipole oscillating vertically. We're assuming the intensity is $E^2$ and that in the far r limit $E$ ...
50 views

### Question about perturbation theory and even and odd wavefunctions

I was solving a question about perturbation theory and I came across something my teacher didn't mention and I can't seem to understand it. In the question there is an external electric field on a H-...
17 views

### Dipole in a dielectric

Intro to electrodynamics,David J. Griffiths Problem 4.37. A point dipole p is embedded at the centre of a linear dielectric material.Find the electric potential inside and outside the sphere. I know ...
28 views

### Direction of Force on a Dipole in a given Electric field

How should I determine the direction of the force in the given case: (p is the electric dipole moment) Using the following formula My book has the following : I am unable to understand the given ...
25 views

### Electric Dipole inside a cavity of conducting sphere [closed]

In the problem, a cavity is taken out of a uniform conducting sphere. Inside the cavity, a dipole is placed as shown in the fig. find the potential at point P
21 views

### Work done in rotating a dipole in NON uniform electric field [duplicate]

I understand that the torque on a dipole due to a non uniform electric field is given by the same expression as that of in a uniform electric field i.e. pEsinθ. Now,how do you calculate the work done ...
27 views

### A non-uniformly polarized sphere

When we have a polarized sphere (say with polarization density $\vec{P}=\alpha r \hat{z}$ for example) and we calculate the electric potential inside, why do the dipoles outside where we calculate don'...
53 views

### Dipoles in 2D and 'dipolar line'

I am currently studying the textbook Surface Enhanced Raman Spectroscopy -- Analytical, Biophysical, and Life Science Applications by Sebastian Schlücker, Wolfgang Kiefer. Chapter 1.2.3.2 Localized ...
51 views

6 views

### What is the force between a charge and a dielectric (polarized in the presence of charge)?

We know the reason why a charged balloon will get attracted to the wall is because of polarization. But how can we calculate the force between the polerized dielectric and a charge depending upon: ...
36 views

### Why are domains formed as separate units?

I was reading about exchange coupling and domain formation in ferromagnetic materials. As far as I can understand, some of the dipoles in the ferromagnetic material align themselves in a group called ...
38 views

### What's the connection between complex charge, complex dipole, and complex electric field?

In standard EM course, the complex EM field was emphasized and studied. However, the complex dipole moment, such as time harmonic dipole moment $\vec{p} \exp{i\omega t}$ was less investigated, as ...
26 views

### What it the force on a electric dipole moment under external constant magnetic field?

I know that the following formula $$F=\vec{v}\times(\vec{p}\cdot\vec{\nabla})\vec{B}+\dot{\vec{p}}\times\vec{B}$$ is valid but can someone provide me with a intuitive/mathematical proof?
82 views

### Curl of electric field due to dipole?

The field lines of electric field of dipole do seem to curl if seen geometrically. If water flow lines were of such shape, a ball would have rotated in it, doesn't this interpretation of non-zero curl ...
24 views

### Non $1/r$ distance dependence for Voltage from dipole radiation

I am getting a strange result with an underwater measurement. When I test the distance dependence of a very low frequency EM wave underwater (1.5kHz), it is much, much shallower than the expected 1/r ...
27 views

12 views

### What is the nature of the multipoles used to shape/re-direct an e-beam?

Imagine having an electron beam, just like in an electron microscope. Now imagine that we have some multipoles prepared in the beams path to influence the shape/path of the beam. My question is: ...