Questions tagged [electric-field]

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Converging Electric Fields on Metal Plate

I have a question, but I'm not a trained engineer, just curious. So bear with me on my explanation. Let's say I have a metal plate. I have DC power supply and I connect the positive electrode on one ...
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6 votes
2 answers
138 views

Finding the electric field due to a "point" dipole in different locations

I'm currently taking a course in Electrical fields and circuits and came across this example problem from the course book. I am having trouble figuring out how to solve it. Below you will find my ...
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Can there exist an arrangement of charge densities that creates a loop in the electric field lines of force?

Can there exist an arrangement of charge densities that creates a loop in the electric field lines of force? In this answer, a poster writes: Note 2 5/8: superconducting loop A uniformly perfectly ...
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How to determine electric field polarity from electric field mill signal?

I have built an electric field mill like this, more info can be found in the (short) wiki article: It works by exposing the sensing electrode to the ambient electric field, which (depending on E ...
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Electric field in a circuit and potential drop

With reference to the above image: Here the battery produces a constant (will it be constant? pl. explain) electric field across the length of the wire, lets say its value is \$\vec E\$ . This field ...
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Is the strength of an electric field the same throughout a conductor connected to a battery?

Is an electric field the same all over a conductor? As electrons move further in a conductor they start coming from high potential to low when moved from high potential end of conductor(cathode) to ...
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1 vote
2 answers
185 views

Best shielding material for a Faraday cage against 36kHz electric fields?

I have a room aka cuboid with 4 x 3 x 2.5 meters. In the 3D center is a device under test. To shield against 36kHz electric fields I want to build a Faraday cage. I learned the hard way that aluminium ...
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Enhancing faraday cage

I have a room aka cuboid with 4 x 3 x 2.5meters. In the 3D center is a device under test. To shield against 36kHz electric fiels I have built a faraday cage by sticking 0,012mm thin and 30cm broad ...
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1 vote
1 answer
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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 ...
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15 votes
5 answers
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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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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 ...
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-1 votes
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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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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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2 answers
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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, ...
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5 votes
3 answers
146 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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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 ...
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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 ...
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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 ...
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1 answer
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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 ...
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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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1 answer
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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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1 vote
0 answers
700 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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2 votes
2 answers
111 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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11 votes
3 answers
3k 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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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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