Questions tagged [electric-field]
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86 questions
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Higher electric field when going off-grid
With an oscilloscope and a 1 m wire at the probe for electrostatic induction I measure 50 Hz electric fields from my mains at a fixed spot in my house. I model reading voltage V_1 at my oscilloscope ...
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COMSOL Simulation Too Slow Due to Fine Mesh in Local Region. How to Improve Performance?
I’m running into an issue with long meshing and simulation times in COMSOL, likely due to the scale differences of my model. I’m simulating an electric field interacting with a thin film that’s 120 nm ...
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Help with forces in an inductor
I am trying to understand why an inductor does what it does. I understand that the curl of the E field is negative the time rate of change of the B field. This works out to the fact that an increasing ...
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What is the capacitive analog to a transformer?
I wonder whether it is theoretically or practically possible to construct a capacitive transformer for ac, i.e. capacitive plates that somehow share an alternating electric field between a primary ...
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What exactly causes current to flow through a circuit/material?
When researching this topic (and having it referenced to me in other questions that I have asked here), I found this image in reference to the electric field that is established by the charge ...
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Drift Velocity of conduction electron in a metal in an alternating electric field
This is a exercise from a book.
Suppose the conduction electrons in a metal are subjected to an
alternating electric field \$E = E_0 \cos(ωt)\$ applied along the x-direction. Let \$V_x\$ represent ...
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How does a changing electric field in the secondary wire of a transformer produce a potential difference?
I want to first give a quick rundown to make sure my core concepts are correct.
All charges produce an electric field (and to a degree a magnetic field in the form of a magnetic moment due to the ...
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Why and under what conditions does a neon indicator light glow in an electric field?
I have a question about the ionization of low pressure neon (inside an indicator light) when put in an oscillating electric field, such as that near a Tesla coil. From reading online about the topic, ...
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Ouroboros capacitor?
The ouroboros is a snake eating its own tail. If we think of the top surface of the snake as being one plate of a capacitor, and the belly of the snake as being the other, what would happen to the ...
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The behavior of reverse bias on PN junction [closed]
I have a question about the reverse bias pn junction, while applying reverse voltage the material is being exposed to a reverse field results from the battery and we assume that this field is at the ...
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Electromagnetics - Finding voltages by iteration approach of solving Laplace equation with relaxation algorithm
The above pictures are from the book,Engineering electromagnetics by Hayt and Buck, 8e.
The problems in the pictures ask for calculation of nodal voltages at the intersecting lines of the grids at a,b,...
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How does EMF strength decrease with distance from a power transformer? [closed]
I'm trying to understand how electromagnetic fields (EMF) decrease with distance from a power transformation station. If the EMF at the station's outer wall is around 150 µT, how far would I need to ...
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Electrically long loop antenna with homogenous near B field inside antenna loop
I wanted to know is it possible to create a loop antenna that functions in a way like a high frequency helmholtz coil. Because a helmholtz coil is usually made with multiple turns of wire having high ...
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Can a photon be modeled using AC driven electron and AC driven wire loop?
Can a photon ("electromagnetic wave packet") be simulated in software as an electron bouncing up and down (for the oscillating E field) and a loop of electrons with neutralized electrostatic ...
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Electromagnetics - Calculating electric field vector given an equipotential surface
I'm trying to figure out how to calculate the electric field vector given an equipotential surface with the equation \$ x^3 + y^2 +z = 1000 \$ where x, y, z are positive. The potential on the surface ...
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