All Questions
129
questions
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force on circular loop due to current in long wire [closed]
my first try is take element at a distance theta from R2 then write force equation and then integrate between -90 to +90 and similarly. but it is getting more complicated. anyone solve this question
- 126k
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1
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33
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Understanding Symmetries and Invariances in Electrostatic Fields [closed]
I'm currently studying electrostatics and I'm having trouble understanding the concepts of symmetries and invariances of electrostatic fields. I understand the basic definitions of symmetry planes and ...
3
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0
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Question about Fourier-coefficients in Griffith's Problem 3.15 (Electrodynamics) [closed]
I am having some trouble with problem 3.15 from Griffith's Electrodynamics. It states the following:
A rectangular pipe, running parallel to the $z$-axis (from $-\infty$ to $+\infty$), has three ...
- 22.1k
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2
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228
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Electric potential infinite box
I have a question about separation of variables to calculate the electric potential.
In the picture below the potential is only on the top of the box, which is infinite in the $z$-direction. What are ...
CommunityBot
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Need help identifying missing boundary condition in charge transport problem
The system I am considering consists of a conducting liquid sandwiched between two electrodes.
The electrodes supply a constant flux of electrons $J_{ext}$.
In the liquid there are also uncharged ...
- 56.4k
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2
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75
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Electric charge and cylinder
An electric charge is distributed with a uniform volume density $\rho$ in a cylinder with a radius $R$ and an infinite length.
Our professor said the following: By symmetry, the electric field is ...
- 6,235
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1
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34
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How to find the capacitance between two metal sheets [closed]
Let’s say I have two metal sheets in a 2D plane. The first one has area A, the second one is infinitely long, and they are separated from each other by a distance d. How can I find the capacitance ...
- 358k
1
vote
1
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62
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'Thin' conducting plate ambiguity
The situation at hand:
We have an infinite, thin conducting, grounded ($V=0$) plate at $z=0$.
Point charge (with charge +$Q$), at $z = a$.
How exactly are the charges distributed? I used the method ...
- 1,713
1
vote
1
answer
63
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Derivation of the ring charge from a disk charge with a hole
I am doing a problem in which I am given a uniformly charged disk, charge density $\sigma$, with radius $b$ and a concentric hole of radius $a$ in the $xy$ plane. A part of the problem I would have to ...
- 4,967
-1
votes
1
answer
44
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Is the strength of the charge equal on all points on an equipotential surface? [closed]
Since the equipotential is calculated by $V = q\cdot \frac{k}{r}$ I suppose that the charge is the same at any point on an equipotential surface but I'm not sure.
- 103k
0
votes
1
answer
117
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Point charge between two infinite dielectrics [closed]
Two infinite linear homogeneous and isotropic dielectrics $\epsilon_1$ , $\epsilon_2$, occupy the regions $z>0$ , $z<0$ respectively. A point charge q is located at the origin. By applying the ...
- 358k
1
vote
1
answer
93
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Prove that the electrostatic potential is zero (Wald) [closed]
Let $V$ be a bounded region of space and let $\phi $ be an electrostatic potential that is source free in this region, so that $\nabla^2 \phi=0$ throughout $V$. Suppose that $x$ is lying on the ...
- 54.5k
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votes
1
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47
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Trying to find the magnetic force applied by an infinite wire on a circuit both carrying different currents
The problem I'm trying to solve is:
We have:
An infinite wire carrying the current I and creating the magnetic field: $\vec{B}(M) = \frac{\mu_0I}{2\pi\rho}\vec{e}_{\phi}$
A square shaped loop ...
- 561
0
votes
1
answer
125
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Force exerted by the southern hemisphere of a uniformly charged sphere on the northern hemisphere
I understand that this question has been asked multiple times before but my question is regarding something specific.
I came across the following solution on the web:
Since $\vec{E}$ is the field at ...
- 13.1k
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votes
1
answer
109
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Multipole expansion along a ring [closed]
I'm supposed to calculate the behavior of the electrostatic potential $V$ at large distances $|r| \gg a$ for the following linear charge density along a ring of radius $a$:
$$\rho(r,\psi, z) = \frac{q}...
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