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 ...
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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. ...
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3 answers
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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)?
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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 ...
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2 answers
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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1 answer
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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?
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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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1 answer
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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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3 answers
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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 ...
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2 answers
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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 answer
232 views

Soldering iron resistance reading

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 ...
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1 answer
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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1 answer
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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 ...
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4 answers
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 ...
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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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1 answer
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Electrical work sign convention

If I understood the correct sign convention it's as shown in the below sketch
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2 answers
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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 ...
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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
2 answers
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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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
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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How to check for the ESD protection of the capacitors

I have this circuit I need to check whether my input capacitors C0001-c0004 are protected for ESD events. My ESD pulse spec: +/-8kV, 2kohms & 330pF. I have taken 130% of this +8kV as my ESD pulse ...
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0 votes
1 answer
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Electrostatic Discharge on new Workbench Setup

I'm setting up a table at home to do some electronics work (assembling microcomputer kits like the Maximite 2 and similar projects that require handling of sensitve IC chips). I have a desktop lamp ...
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2 votes
1 answer
162 views

Calculating the unknown charge using the \$2\$ remaining charges in this arrangement

The overview of the problem and the solution and my thoughts are as below. "/*" represents about my comment. We'll handle the \$3\$ point charges in the vacuum. Firstly the \$2\$ charges are ...
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1 answer
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Imagining electric flux intuitively

I know that electric field doesn't really flow, so whenever I'm trying to imagine electric flux like an amount of water passing through a window intuitively, I can't relate these two things. Can ...
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3 answers
170 views

Can an electrostatic motor produce constant torque at varied speed?

The idea of this question came from a DC motor that produces less torque by greater speed. Can an electrostatic motor produce constant torque at varied speed? How can I make a mathematic model of ...
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1 vote
1 answer
117 views

How it is determined whether an equal sign can be used within the boundaries?

Why equal signs weren't used for limits(r < a, a < r < b, r > b instead of r <= a, a <= r <= b, r >= b)? Two concentric spherical surfaces of radius a and b = 2a are in vacuum ...
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2 votes
3 answers
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Can an electrostatic voltage be divided with very large resistors?

Is it possible to divide an electrostatic voltage from a Van de Graff generator or electrostatic generator with very large resistors?
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1 answer
101 views

Charge transfer in conductors of different metals by touching

when we touch two metallic conductors one is neutral and other has excess of charges, Case 1- Both metals are of copper, then we can calculate actual charges on them at steady state by capacitance ...
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1 vote
2 answers
70 views

Static Electricity - and charges

When we comb our hair (with a plastic comb) and then bring the comb close to bits of paper, the bits get attracted to the comb. I understand this is because the comb is now electrically charged. Why ...
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1 answer
38 views

Voltage boosting device for electrostatic experiment

I want to get 2kV to 6kV (adjustable) for performing electrostatic experiments with parallel plates. What device can produce such high voltages from the 230V mains? I watched a video on YouTube ...
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0 answers
267 views

Electrostatic protection - input and output ESD protection added to op amp w/built-in ESD

I have an op amp circuit using the OPA2626 that has a built-in input/output ESD protection of +/-3000V human body model. The circuit is 3.3V single supply, non-inverting, with only an external ...
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1 vote
0 answers
186 views

What is considered ESD Sensitive and non-ESD Sensitive?

For example, if an integrated circuit has an HBM rating of 8 kV but is now embedded in a circuit board, which is now installed inside an equipment assembly, I would think the ESD susceptibility of the ...
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-2 votes
1 answer
404 views

Harrington rod from spinal fusion might be acting like a human EMF antenna [closed]

In 1994, I had a spinal fusion surgery to correct Scoliosis which was a result of my medical condition, Spinal Muscular Atrophy Type II. I've used a wheelchair my entire life. Because my upper body ...
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1 vote
1 answer
54 views

Energy subtracted from a capacitor for a given voltage drop

I am trying to estimate, from a total energy of a capacitor (which is the output of a charge pump circuitry), how much energy do I have to power up an LED before the voltage goes below a certain ...
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0 votes
1 answer
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ESD strap/mat when working on battery powered devices/PCBs

When the devices you're working on are plugged in an outlet or when you're working on loose components, it makes perfectly sense to ground yourself to the outlet or any other solid ground through a ...
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1 vote
1 answer
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Voltages and charges with regard to ESD

My question is with reference to this question - ESD protection using a capacitor I am unable to grasp the relation between charge, voltage, and capacitance, although I can understand all these terms ...
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0 votes
1 answer
60 views

Protection against electrostatic paint by draining the charge

I have a circuit for an automotive sensor aimed for 24V supply. The circuit itself is well tested for EMC requirements including power line transients and EMC immunity. Usually the requirement is for ...
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0 votes
1 answer
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When grounding conductors in electrostatic problems, is the reference point of electric potential defined at infinity or the ground?

I am confused about the meaning of 'grounding' in electrostatics. My textbook claims that any grounded conductor has zero electric potential, but it seems to me this claim can have two different ...
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0 answers
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Capacitance calculation of comb-drive actuator

I just want to make sure that I am performing this calculation correctly... From this COMSOL study, I gathered the following info... $$C_t = N\frac{\varepsilon_o\varepsilon_rl_ot}{d}$$ $$C_f = \...
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7 votes
1 answer
324 views

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 ...
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1 vote
2 answers
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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2 votes
3 answers
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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0 votes
1 answer
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MOSFET Triggers with Electrostatic Energy

In the attached circuit with a 5V relay and a 30V load across it, I've noticed the FQP30N06L MOSFET triggers with even electrostatic energy (touching the gate). The difference between the circuit ...
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