Questions tagged [electrostatics]
Electrostatics is concerned with the electrical fields and scalar potentials of stationary electrical charges and charge distributions. Use this for questions about electromagnetic situations in which currents and magnetic fields are absent, otherwise use the [electromagnetism] and/or [magnetic-fields] tags.
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Determination of null point in a field with more than two charges [closed]
To determine the null point of two like charges is to find the point where the net electric force is zero.
However, when it comes to three charges with two like charges and one unlike charge, or five ...
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Do conductors have bound charges?
In Griffiths, the total charge density of a dielectric is: $\rho$ =$\rho_b +\rho_f$.
I have several questions:
Can the total charge density of a conductor be written as the equation above?
Do the ...
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Energy in Dielectric Medium as a Sea of Dipoles
Simply, why is the energy density in a dielectric medium = $\frac{1}{2}K\epsilon_oE^2$ where K is the dielectric constant of the dielectric medium?
Working proof
Consider a capacitor that is charged ...
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Parallel plate capacitors with dielectrics [closed]
I was studying capacitors with dielectrics ,where my teacher gave one example for us to solve
between the parallel plate capacitor there is dielectric which is further divided into four dielectrics ,...
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How to avoid the ordinary Coulomb solution in QCD?
To see where QCD starts to differ from the behavior of EM fields, we might begin by looking at the classical field. A search brings up
[question 339978] and [question 360061] but no answer is found ...
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Electric field experienced by a charge
We have two charges, say $Q_1$ and $Q_2$.
The magnitude of the electric field $E$ experienced by charge $Q_2$ is:
$$E = \frac{k Q_1}{r^2}$$
where $k$ is Coulomb's constant and $r$ is the distance ...
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Find Velocities When Distance is Minimal - Electrostatics [closed]
Introduction/problem:
Given two charges $q_A$ and $q_B$ with values $400 nC$ and $900 nC$ respectively, and masses $m_A = 1 gr$ and $m_B = 3 gr$. charge A is gieven a velocity of $v$, and given that ...
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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
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Electric field at a point due to dielectric inserted in between a parallel plate capacitor [closed]
Here, I have a parallel plate capacitor with each plate having surface charge density $\sigma$. A dielectric of dielectric constant $K$, is inserted partially between the two plates. What would be the ...
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Will the electrical potential difference between the Windward and Leeward sides of a mountain range generate electrical current?
I would like to know if it is possible that the electrical potential difference between the Windward side and the Leeward side of a mountain range, due to a thunderstorm occurring on the Windward side,...
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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 ...
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Deriving the Yukawa potential from the field of a screened charge [migrated]
I am trying to derive the Yukawa potential from the electric field of a screened positive point charge, which is
$$
\vec{E}(\vec{r}) = \frac{q}{4\pi\epsilon_0}\frac{e^{-kr}(kr+1)}{r^2}\hat{r}.
$$
The ...
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Error in reasoning for electric field outside a cylinder
Suppose we have a cylinder of length $L$ with uniform charge density that has its central axis on the $z$ axis and the center of its bottom face located at the origin. Let $P_z$ be any point that lies ...
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Electric dipole
I have a very silly question to ask. If two charges $+q$ and $-q$ same in magnitude form a dipole in a uniform electric field $\vec{E}$, then the force on the $+q$ charge acts in the same direction as ...
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Potential of circle and $n$-gon
Consider power central fields $f \sim r^k, - \infty < k < \infty$,
and unit circle, "charged" in the sense of the field.
We will be interested in the potential within the circle,
i.e. ...
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