Questions tagged [electrostatic]

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31 views

Gauss' law for two point charges?

When we model electric field as something that represents the "flow" of something that is conserved, we can prove that the flux due to a single point charge, through the following surface, Flux ...
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2answers
60 views

What is the energy density of voltaic piles?

I heard voltaic piles have very small power but long lifetimes so I was wondering what their energy density per unit volume and energy density per unit mass is. If specifying a type of voltaic pile ...
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2answers
44 views

How I can simply measure interwinding capacitance in a transformer with electrostatic shield

I want to measure which is the effect of the connection of the electrostatic shield (between primary and secondary) to ground (or to neutral) in reducing the interwinding capacitance in my transformer....
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1answer
64 views

Switching 1875 Volts through a relay

I am trying to create an electroadhesive device that I can switch on and off easily, however, after using one relay that worked beautifully to do this function, I went out and bought a 4 channel relay ...
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0answers
58 views

A conductive ball connected to a capacitor

I am not asking for a task solution, but rather how to solve a problem. Say I have a ball of radius R, charged to a voltage of U (relative to the ground). I also have a flat capacitor with a side ...
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1answer
80 views

Soldering Iron and Electrostatic Bracelet Connection

I have a DIY soldering station and I want to ground the soldering iron and I also want to use a electrostatic bracelet connector for the soldering station. Can you please help me how to connect the ...
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2answers
48 views

Something wrong with open USB circuit, electrostatic problem

I faced a strange problem with the following circuit. I'm using some buck converters and an Arduino. The buck converter (Vout = 5.25v) is for a USB charger (up to 2 Amps). Well, I think the circuit ...
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2answers
114 views

ESD problem on water tank?

We have a water level monitor attached to a water tank. The water monitor has an hydro-static (output 0-5V) water sensor that goes to the bottom of the the tank. (See figure) In most cases this works ...
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0answers
107 views

Docs, Tutorials, or examples for electrostatic sim in FEMM from LUAscript

I am looking for any docs, tutorials, or examples for electrostatic sim in FEMM from LUAscript. I've found plenty of information on magnetic sims, but very little on electrostatic, and even less ...
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1answer
133 views

How to convert high voltage DC at low amps to low voltage DC or AC at high amps?

How to convert high voltage 500 volts DC at very low amps to lower voltage 12 volt DC or AC at high amps? Must I use an electrostatic motor or can I use an op amp? The reason I am posing this is a ...
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1answer
105 views

How to extract energy from an alternating electric field?

Given an alternating electric field E inside e.g. a big parallel plates capacitor, how can you make use of the field's energy to power an electronic device? So far I thought of putting two smaller ...
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0answers
60 views

System of multiple conductors: image method

The problem statement, all variables and given/known data The following figure represents the traversal cut of a system with two cylindrical equal conductors of radius r0 length l at a distance d ...
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0answers
13 views

Partial capacitances of a system of conductors - conductor acting as a shield

I have a small question about the following problem. The figure represents the cross-section of a three-conductor system comprising a communications coaxial cable of length l running parallel to a ...
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1answer
89 views

How is this copper showpiece making static electricity

I'm trying to make a showpiece which generate static electricity just like in this YouTube video LINK Does it have Tesla Coil (Slayer Exciter) inside it or Negative Ion Generator?
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1answer
89 views

Insulating from static electricity

I am happy to announce that my pocket extra-strong static electricity generator project is now complete and works well. However there is one problem, I am often getting zapped severely (to the extent ...
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2answers
94 views

What's the current leak path of the electrostatic discharge during an EMC test?

When we develop a new product we need to pass the EMC test,I really wonder what's the current path during a electrostatic discharge test. Here is the test situation: Q1: If the EUT(equipment under ...
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4answers
2k views

Why no macroscopic electrostatic electromechanical parts?

So, I understand that relays, motors, and other electromechanical devices are almost always electromagnetic devices. Why is this? I know that electrostatic motors exist, but what makes them ...
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2answers
117 views

Energy lost in Capacitors [duplicate]

Suppose there are two identical capacitors of capacitance C and one of them is charged to a potential V and gets a charge q. The energy stored in this capacitor is \$1/2cv^2\$ or \$q^2/2c\$ . Now this ...
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2answers
220 views

How should I use a static-shielding bag prior to opening, and why?

After grounding the ESD mat and wearing the properly grounded anti-static wrist strap, what is the correct process to take the contents out of the static-shielding bag and take it onto the antistatic ...
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1answer
170 views

What is a safe way to carry around (wrt ESD safety) a single-board computer in an enclosure like this? [closed]

I have a single-board computer and an enclosure, which will hopefully look like this in the end: I have three small questions: If I only hold it from the edges while assembling the enclosure, do I ...
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1answer
76 views

why dont we just use ion wind flowing through evacuated pipes?

Why dont we just use ion wind flowing through evacuated pipes? I ask this because if we reduced the atmospheric pressure in the pipes somewhat, and made them out of a cheap yet durable insulating ...
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2answers
113 views

Accurate explanation of diode reverse bias mechanism

For quite some time I haven't been able to convince myself how reverse bias works using conventional explanations that involve words like 'minority carriers', 'majority carriers' etc. which do not ...
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1answer
89 views

Electrostatic in an Arcade Machine (Arduino)

I set up an arcade machine, which consists of an Arduino, a coin validator, a 12 V adapter, and a PC. It works as expected, when I insert a coin, a signal is captured via Arduino. The output normally ...
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1answer
54 views

Bar connecting leyden jars on wimshurst machine

So I finally finished building my wimshurst machine! Disks are around 14" and it works, but the sparks get about 1/2" :( so i was wondering what i could fix and for my metal thats connecting the ...
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2answers
77 views

Can I use a threaded rod on a wimshurst machine

On my Wimshurst machine which is built similar but not the same as http://steampunkworkshop.com/how-build-wimshurst-influence-machine-part-1, I'm using a threaded rod that comes out of the Leyden jar ...
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1answer
223 views

Motion of an electron in a uniform electric field

An electron moves from negatively charged to positively charged terminal of a battery. When it does so, its electric potential energy decreases i.e it moves from high to low electric potential. But it ...
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3answers
212 views

electrostatic and capacitors… more about the capacitor though

done some reading, got me thinking. done some researching got me doubting... but my question is. is there a capacitor that doesn't degrade and doesn't lose capacitance over time? from all of my ...
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1answer
96 views

Protecting digital electronics from nearby high voltage sparks

I am controlling a high voltage power supply to generate corona discharge. To switch it on and off I am using an AC relay controlled by a microcontroller as shown in the figure. The controller ...
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0answers
36 views

Charge distribution/movement in an insulator

The way I understand it, net charge in a conductor spreads out evenly over the surface, while for a charged insulating object, the charge will tend to stay clustered around the spot where it was ...
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1answer
65 views

Determine the position of the charge for equilibrium

Question: A system of three electric charges lying in a straight line is in equilibrium.Two of the charges are positive with magnitude Q and 2Q,and are 50 cm apart.Determine the sign,magnitude and ...
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1answer
91 views

Need help with exam problem [closed]

Can somebody please help me with this task: Two equally large (r = 5 cm) volume charged non-conductive spheres are fixed so that their centers are a = 1 m away. In the middle of the centerline ...
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0answers
47 views

Point charge between parallel plates

Let's say we have 2 grounded parallel plates and we place a charge Q between them. I'm studying Green's reciprocity theorem and in using it the author states that the charge induced on the plates ...
2
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1answer
81 views

Unlimited electrons?Can a conductor cancel a very strong field?

I started studying about how a conductor behaves once placed inside an electric field E0 . The electrons will move inside the conductor according to the electric filed's direction gathering at one ...
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1answer
2k views

How to charge a capacitor with static electricity?

I want to charge a capacitor using static electricity generated by me (walking on carpet etc.) and try power a small LED or if that doesn’t work a reading on the voltmeter would be fine (it’s for a ...
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1answer
121 views

Why laptop reboots after electrostatic discharge

So why does this happens when my laptop is plugged to the charger? Typical charger scheme looks like this: What is the path for discharge current? Low voltage part seems to be isolated from power ...
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2answers
949 views

Electrostatic precaution for sensitive chip

I just figure out today that I always manipulate chips with the "Electrostatic sensitive devices" sign by hand. I never use a grounding bracelet or even a clamp. Even if I doesn't take such precaution,...
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3answers
805 views

Electrical Machines based on Electric Fields

Our teacher asked us this question during the lecture for Power Electromagnetics. We know that Electric Fields and Magnetic Fields are easily transformable into one another. And they are used greatly ...