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.
4,793 questions
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Could a partial dissipation of proton and electron fields provide a simplified model of the nuclear force? [duplicate]
For example, the electromagnetic field surrounding a hydrogen atom has less energy than the sum of the energies of an electromagnetic field surrounding an isolated electron and an electromagnetic ...
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How electrical capacitance of just a wire differs from capacitance of a wire next to another isolated wire?
I connect one end of strands from one wire of a USB cable (another end in the air). Another wires in the cable are isolated from that one and each other and ends are in the air. I wonder how ...
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1 answer
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Would reflections make an electromagnetic wave more penetrating into metals?
First i should clarify how i arrived at this question. I understand that in the case of an EM wave reflected off a higher refractive index surface, the reflected electric field vector changes ...
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Does a stationary electron hit by an electromagnetic wave move diagonally?
If a stationary classical electron is hit by an electromagnetic wave, does it move diagonally, since the electric field moves the electron and the magnetic field of the EM wave causes a Lorentz force ...
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1 vote
3 answers
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Where is the increased mass reserved based on Einstein's mass-energy equation?
Assume a huge parallel-plate capacitor with plates located at an infinite distance away from each other. If we tend to move a positively charged object ($+q$) with a rest mass of $m$ against the ...
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1 answer
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How does field concept localize electromagnetism from Coulomb’s law? [closed]
From super position principle of electric field, the electric field at a point can be calculate by summation of fields from other charges. I do not see any different from summation of force from ...
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What is the equation for the change in electric potential due to a field generated by a point charge? [duplicate]
I'm a current AP Physics 2 high school student with a test in a few days; a swift reply would be very much appreciated. Thank you in advance. My question is concerning the formula for the change in ...
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1 vote
5 answers
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Electric field around a wire
Does an electric field exist outside a non-perfect conductor wire with a constant current flowing through it? I think there might be an electric field parallel to the wire because current in the wire ...
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How long can electrohydrodynamic (EHD) propulsion last?
In an electrohydrodynamic (EHD) propulsion, I know that there is a thin wire with high voltage (emitter) and a 0-voltage collector. Because of the radial electric field around the thin wire, electrons ...
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1 vote
2 answers
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Why does the Poisson equation help to compute the electric field $E$ when the integral is intractable?
Currently I am reading through Griffiths Introduction to Electrodynamics and I am in chapter 3.1 about Laplace's equation. The author explains that our aim is to compute the electric field given a ...
3 votes
5 answers
474 views
Rotation of electric field vector or polarization
Given a circularly polarized light field. I am using complex notation to represent the field, $$\vec{E}(z=0, t) = \frac{1}{\sqrt2} [ \hat{x} (\cos(\omega t) - i \sin(\omega t)) + \hat{y} (i\cos(\omega ...
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How does electric potential vary between two positive test charges? [closed]
If you plot a graph showing the variance of electric potential between two charges, does the middle have a maximum or minimum electric potential and why?
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7 votes
6 answers
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How exactly do charged capacitors decrease current?
I recently learned about how capacitors function in electric circuits, and I came across an apparent contradiction that I wanted to ask about. On one hand, I know that as charge builds up on the ...
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Why am I getting Work done as negative in bringing a positive charge near another positive charge? [duplicate]
Let us consider a charge $Q>0$ at origin. Let $P(r,0)$ where $r>0$ be on $X$ axis.Consider a point $M(x,0),\:x>r$ from which we have to move a charge $q>0$ towards point $P$. Now I am the ...
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How is the $E$ field at the surface of a charged rod affected by its dielectric constant?
I am seeking clarification on a concept from a test question I have been studying. Essentially, the question gives an example of an infinitely long charged rod, made of an insulating material. The rod ...
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