Questions tagged [electric-field]

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The equation of surface charge density is incorrect with only the sign is opposite of capacitor of cylinder form

The capacitor of the 2 cylinders exists. As shown in the diagram, the righter space has been filled with the dielectric of \$ \epsilon_{1} \$ and the lefter space has been filled with the dielectric ...
15
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5answers
2k views

Cable shielding adequate for video, but not audio frequencies

I am no expert in audio equipment, but to educate myself I have been studying. In the process, I came across a video which tests the audio frequency shielding of a purported shielded video cable. (I ...
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2answers
65 views

How many newtons are there in one coulomb of charge?

Or, I should have said, how many newtons of force does one coulomb of charge exert? At a distance, presumably, of one meter? Since N/C is supposedly equivalent to V/m? P.S. What are the values for a ...
-1
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1answer
59 views

How can formal insulators “conduct” electric and magnetic fields?

Is there an explanation regarding the ability of an insulator between capacitor's plates to be permeable to an electric field? The terms "valence band" and "conduction band" the ...
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0answers
54 views

What is the Relationship between Magnetic Flux density and electric field intensity

I was given this question by a teacher and I have scoured the internet for a formula or solution to this question, all to no avail, the question says "in a certain region of space, the magnetic ...
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2answers
113 views

A DC current through a inductor does not create electric fields

While studying about electric fields and magnetic fields I came across this picture: and this: from this website and it indicates that there is an electromagnetic field around the loop of wire, ...
5
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3answers
101 views

Capacitor in presence of an external electric field

Let's consider a capacitor made of a couple of parallel metal strips (suppose they are made of perfect electric conductor) as shown in the figure, which represents a little capacitor. Suppose an ...
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0answers
29 views

Gauss theorem on a finite sheet

I derived electric field at a distance z above and perpendicular to the centre of a sheet as E = Now i want to approximate the sheet as a point charge and derive the electric field . I am not sure ...
0
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0answers
51 views

Can electronic devices be installed on the pillar of UHV towers such as 345kV?

Can electronic devices be installed on the pillar of UHV towers such as 345 kV? Because I have an idea to install a remote automatic control electronic device on the tower to control the rotation and ...
0
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0answers
24 views

pn Junction - Depletion Layer

From the textbook that is prescribed for my course as well as on google, I have been told due to the diffusion of electron from n->p and the holes from p->n, positive ions are left in the n-...
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1answer
32 views

What's the logic inside the formula for the calculation of the maximal envelope modulation amplitude of two temporal interfering electric fields?

Since my question is a bit elaborate, I will first write some details. Thank you all! I refer to the study conducted by Nir Grossman et al. (2017) about the use of the temporal interfering stimulation ...
1
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1answer
65 views

How to redirect electric field lines with a copper plane

I have been testing a capacitive sensing circuit in which an electric field is projected vertically to sense a finger (a grounded conductive object). On the PCB, a tx and an rx are 2 copper structures ...
0
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1answer
52 views

calculate force on object between capacitor plates without knowledge of area

I am given an exercise with a very simple circuit simulate this circuit – Schematic created using CircuitLab I am asked to find the voltage of the voltage-source V1 such that an object with a ...
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1answer
31 views

Signed or unsigned distance in electric potential due to point charge(s)

I am reading about the electric potential: from wikipedia: The electric potential (...) is the amount of work energy needed to move a unit of electric charge (a Coulomb) from a reference point to the ...
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0answers
254 views

Determining Electric Field on a Charge Plane

Question: A plane \$x+2y=5\$ carries charge \$\rho_s=6nC/m^2\$. Determine electric field at \$(-1,0,1)\$. My try: At first, I calculated gradient Let, \$\phi=x+2y-5\$ \$\begin{align}\\ \vec\nabla\phi&...
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2answers
91 views

How to measure the potential gradient between large capacitor plates?

I have built a capacitor for a biology experiment, but I need to measure the potential gradient between the plates. Mainly I am going to apply an AC current between the capacitor plates to have an ...
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3answers
2k views

Is the electric field in a wire constant?

If \$V=I\cdot R\$ according to Ohm's Law, that implies that \$\frac{\mathrm dV}{ \mathrm dx} = \frac{I \rho}A\$ across an infinitesimal length of conductor, which is constant at all points along the ...
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3answers
112 views

Electric field throughout a semiconductor

Suppose I have a semiconductor bar of length 2mm and I am applying a potential difference of 2V across it. Will the magnitude of electric field be same throughout the bar OR will it be different at ...
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0answers
115 views

Energy band diagram showing band bending in semiconductor when an external electric field is applied

This above Energy Band diagrams are what I found on an online forum. However I dont understand the EB diagrams drawn for the p type SC since it is different with respect to the formula and diagram ...