Questions tagged [electric-fields]

For questions that utilize the concept of electric fields (commonly denoted by the letter E), or for questions whose answers likely involve electric fields. More specific than the [electricity] tag, as questions about the phenomenon & theory of electricity do not necessarily involve the discussion of fields.

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Complex electric field in second order polarization

I am reading an introductory article on nonlinear optics. Here is what the part that's troubling me says: $$\tilde E(t) = Ee^{-i\omega t} + \text{c.c}$$ When this electric field is incident on a ...
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Does constructive interference automatically imply bright fringes at all times?

Suppose two waves interfere constructively at some point, in a double slit experiment set-up. This essentially means that the two waves have their peaks and troughs in sync with each other, and there ...
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Interaction between electron and electric field

Let consider that we are using parallel plates to create electric field. And let assume that there are small holes in both the plates (holes on both the plates are aligned). Now if we bring a electron ...
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How does the electric field pattern looks like when current is moving inside the conductor and why this field is uniform?

We know that electric field is uniform inside a normal electric circuit consisting of some battery source and a conducting wire , $\mathrm{E}$ will be $\mathrm{E=V/d}$ , but I cannot think of a reason ...
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Charged particles simulation in different planes

I have been trying to figure out an analytical/numerical method to calculate the following: there is a charge distribution (gaussian) of positive charges in a plane, whereas there are negative charges ...
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What is the electric field in a region of constant potential?

I am working on a problem set on electrostatic potential and there is this one particular question posed that states "The electric field in a region of constant potential is?". The answer ...
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How to find value of electric field $E$ and the concentration of neutral particles $N$ in gas discharge?

In gas discharge physics: I want to find values as shown in picture below:
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Electric field of a configuration of five parallel infinite slabs of dieletric materials

I am having a hard time trying to figure out how to proceed in order to calculate the electric field of a configuration of five slabs of dieletric (insulating) material (actually one of those is ...
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Why does near-field attenuate at $\frac{1}{r^6}$?

So far-field makes intuitive sense to me, it attenuates at $\frac{1}{r^2}$ much like gravity. This is just common sense since the area for the surface of a sphere relative to its radius has a $r^2$ ...
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Derivation of the electric potential inside a non-conducting sphere

Assuming that the electric field at a distance $r$ from the center of a non-conducting sphere with radius $R$ and uniformly distributed charge $Q$ is $E=\frac{1}{4\pi\epsilon_0}\frac{Q}{R^3}r$, we are ...
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I was taught that , in a electromagnetic radiation , changing electric field is produced due to oscillation of charge this changing electric field give rise to 'changing' magnetic field and this ...
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Producing constant constant electric field [closed]

Can we create constant electric field using varying magnetic field? And also , How the varying magnetic field give rise to varying electric field not a constant electric field .
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Expansion of the derivatives of the electric and magnetic fields

I'm reading electrodynamics physics notes that describe a cavity of length $L$. The cavity is said to lie along the $z$-axis from $-L$ to $0$. The electric field is polarized in the $x$ direction and ...
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Electric field inside current carrying conductor

Is the electric field inside current carrying conductor changing electric field or it is a constant electric field? And how this electric field produce magnetic field?
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Changing magnetic and electric field

Does a changing electric field create 'constant' magnetic field or 'changing' magnetic And , does a changing magnetic field create 'constant' electric field or 'changing' electric field
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Why reversing the direction of electric current reverses the magnetic fields' direction?

I don't understand why magnetic field gets reversed when the electric current is reversed. So I searched on the internet but couldn't find any answer. Could someone plz explain this phenomenon?(with ...
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According to Gauss's theorem the integral of $\vec \nabla⋅(\phi \vec E)$ taken over the whole space is equal to 0?

The following excerpt is from Space—Time—Matter by Hermann Weyl, starting on page 101. Among the things I'm not understanding is Weyl's assertion that the integral of $\nabla\cdot(\phi\mathbf{E})$ ...
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Why do these 2 formulas about magnetic field conflict with each other?

$\newcommand{\tl}{\tag{#1}\label{#1}}$ Magnetic Field of a current is: $$B = \mu_0 I / (2 \pi r)\tl{01}$$ Magnetic Field of a Moving Charge is: $$B = \mu_0 qv\sin\theta / (4\pi r^2)\tl{02}$$ So I ...
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Can we express magnetic field strength similar to how we express electric field strength?

I'm currently studying magnetism and I'm looking to make some connections with electricity, namely how we define the two fields. For the electric field, I know that the electric field strength is: \...
Let us consider a $+q$ charge and we are trying to find out electric intensity $E$ at a distance $r$ from $+q$.The conventional way is this: We take a gaussian sphere of radius $r$. We know the ...