All Questions
12
questions
2
votes
2
answers
227
views
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
-1
votes
3
answers
78
views
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 ...
- 65
0
votes
1
answer
223
views
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 ...
- 33
1
vote
1
answer
53
views
The intepretation of $d$ in $p=qd$
In Griffiths Example 4.1, the author derived the polarizability of a uniformly charged spherical cloud with radius $a$. For an external field $E$, the electron cloud will shift to the left with a ...
- 123
0
votes
2
answers
268
views
Direction of electric field
When we place a positive test charge near a positive charge, it moves away from it. If there is a negative one instead, it follows a curved path. That is, the field of positive charges originates from ...
- 153
0
votes
0
answers
20
views
How to interpret bound charges geometrically?
Conceptually, it makes sense to say that when there is an electric field along $E=E\hat{n}$, then given a polarization $P$, the amount that $P$ aligns with the electric field is simply the dot product ...
0
votes
1
answer
2k
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 ...
- 1,038
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
2
votes
1
answer
5k
views
Electric potential energy and equipotential lines
Consider an electric dipole as in the figure. There is a vertical equipotential line/surface. If I understand correctly, electric potential is the amount of work done per unit charge in bringing a ...
- 183
0
votes
2
answers
1k
views
Dipole and infinite conducting planes
I have an electric dipole that is located at a distance $a$ from two infinite conducting planes that form a right angle between them.
I'm asked to find the electric potential in all the points that ...
- 1,183
1
vote
1
answer
93
views
Where does the net charge on a hemisphere appear to act from?
I was wondering if, like centre of mass, there is anything called "centre of charge".
- 13
0
votes
1
answer
151
views
Help with this question (Eletric Fields, Dipole) [closed]
The answer in the textbook in the solutions manual is the following:
I didn't undestand the last step. He said he did a binomial expansion, I just can't figure out! Appreciate any help.
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