# Questions tagged [electrostatic]

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### why does voltage drop across a resistor

I have seen the explanations about the energy lost in from of heat, but that energy comes from the net reduction of kinetic energy of the electrons (reduction of current). More over voltage is a ...
106 views

### Charging by electrostatic induction in a new way. Will it work? Instead of connection to Earth I am connecting to another conductor

I am adding the figure of a conventional setup for electrostatic induction. The drawn setup on paper is the special setup. If you don't want to read whole description then just read the summary. ...
1 vote
105 views

### How can a conductor have voltage without charge on it? Taking in electrostatics [closed]

What does it mean if the potential of a conductor is Kq/r which is at r distance from the charge q? How can a conductor having no real charge have some potential (which is here KQ/r)?
119 views

### Is it possible to shield a metal ball with electrostatic shielding, or any other way?

Is it possible to shield a metal ball by the electrostatic shielding such that metal ball doesn't suffer electrostatic induction? There is an electric field present near the metal ball but I want that ...
99 views

### Charging by electrostatic induction

In the given figure, if we connect the positively induced side of the sphere to the earthing instead of connecting it to the negatively induced side, then will the sphere get negatively charged ...
103 views

### Why does a capacitor plate connected to Earth lose charge?

Can you please explain this to me? Is this correct? Why does the plate become neutral if the field outside the capacitor is zero?
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### Does current flow from earth connected conductor in uniform electric field?

If we place a conductor inside of uniform external electric field then opposite charges will get induced on the both sides of conductor. What if we connect two earth wire to each side, will continuous ...
30 views

### Electric fields inside the parallel plate capactitor where 2 dielectrics are inserted

This post is of check-my-work one. I need your check. The green-painted parts are which I want to derive the equations. 2 parallel-plate capacitor with 2 dielectrics which are inserted between the ...
1 vote
52 views

### Generation of electrostatic induction

I need to generate a 500 volt electrostatic charge. How can I do this? I don't have a Van de Graaff generator. What are some practical suggestions? Basically I want to do an experiment in which I need ...
26 views

### Repelling charges and current flow

The electrostatic force between two like charges is repelling. This concept is fairly clear to me with Coulomb's law and electric fields. So two electrons will repel each other. Given this statement, ...
103 views

### Maxwell equation

$$J = \sigma E - \frac{dD}{dt}$$ I am having difficulties understanding this equation. I know that $\small J = \sigma E$ in the equation is a form of Ohm's law, but what is the other part?
1 vote
68 views

### UART IO not working, placed multimeter to measure voltage and IO began working instantly - why?

We are a bit stumped on this and wanted to see if anyone had any experience or perspective on this. Description of Event We are communicating via UART from a 3.3V processor to a Sim7000G (1.6-1.8v). ...
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281 views

### Can I die from touching one capacitor lead?

Suppose I have a charged capacitor and I only touch one of the plates or leads. Will current start flowing through my body? I think yes, because there is an electric field between one plate and Earth/...
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### What would happen if I inject the charges (ESD) at PCB many times and PCB is completely floated (isolated) from the earth?

Just I wonder: If I inject the charges (ESD) at PCB many times and PCB is completely floated (isolated) from the earth. Will charges be dissipated or remain? I think charges will be charged in the ...
145 views

### Vaneless ion wind generator: isn’t the maximum output theoretically limited?

I was thinking more specifically about the Dutch model of the kind EWICON : https://en.m.wikipedia.org/wiki/Vaneless_ion_wind_generator Here is what puzzles me: If the wind is strong enough to carry ...
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1 vote
232 views

I’m learning about electrostatic discharge and I’ve read that my soldering iron should have a ‘grounded tip’ which I think means its power plug should have an earth prong which it does. I took a ...
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### Why capacitor 3 loses energy as it induces current in other capacitors

plate B of capacitor 1 and 2 are connected to capacitor 3 to provide potential difference. Part A includes capacitor plate and dielectric. When part A and B are connected the positive charges will be ...
1 vote
70 views

### What will be the steady state Charge distribution of given configuration- battery vs capacitor

I was try to figure it out what should be the charge distribution over the spherical conductor of radius R (in figure below) in following two configurations- Assumptions length of wire (l) connecting ...
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### Ultra electrostatic capacitor generator

Part B of ultra capacitor 1 and 2 are connected to ultra capacitor 3 to provide potential difference. Part B includes charge collector and electrode. Part A of ultra capacitors 1 and 2 include the ...
111 views

### Generating current using capacitor

If you get a capacitor that is two plates and a dielectric and next to it you put two plates close but not in contact at opposite sides and the capacitor in the middle is charged, each of its plates ...
73 views

### Can a multi meter measure a potential static discharge?

Can a multi meter measure a potential static discharge like between hands and laptop before I open cover and replace a battery? Like if I touch laptop and my hands with the each two probes of a multi ...
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35 views

### Electrical work sign convention

If I understood the correct sign convention it's as shown in the below sketch
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### Trying to make an electrostatic battery charger

Can the DC layout charge a battery? I see as if it is in a solar cell format. I know that for a solar cell, when light hits the cell an electron is discharged but the semi conductor only lets it go in ...
37 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 ...
1 vote
96 views

### USB digital microscope and ESD safety (maybe power supply problem)

I have an ESD mat, ESD wrist strap and a Chinese USB (power only) digital microscope(Andonstar ADSM201.) I use the microscope for soldering and inspection at home for hobby projects. The microscope ...
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49 views

### Using method of image to find surface charge density

Two point charges of 50nC and -20nC are located at (-3,2,4) and (1,0,5) above the conducting ground plane z=2. Calculate: a)The surface charge density at (7,-2,2), b)$\vec D$ at (1,1,1) Now, ...
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1 vote
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### What is causing this weird effect with aluminum?

I grabbed an LED and then scraped an aluminum plate with a pin, and it turned on at some points, at first I thought it was electrified but it wasn't, then I tried with another aluminum plate and it ...
1 vote
40 views

### Energising Electrostatic Charge Into Nylon Ribbons? Is it possible?

Forgive me for how high level this is but this is the goal I'm trying to achieve here: I want to build a device that has dangling ribbons of a material (lets say nylon for now) that can be actuated ...
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6k views

### Is it safe to use hot glue in electronics?

I know question seems too basic to ask but I couldn't find any specific information anywhere . I want to use hot glue gun to stick components and cables into cardboard to prevent them move or break ...
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