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Electrostatics
Electrostatics is the branch of physics that deals with the study of charges at rest. A common electrostatic phenomena is plastic wrap sticking to your hand and itself when removed from the box. Everything to do with electrostatics goes in this category.
1,860 Questions
When did Benjamin Franklin discover static electricity?
Benjamin Franklin was not the discoverer of static electricity. Although, he did give a history recorded presentation of it. Static electricity can be dated back to the 6th century BC, by Thales of Miletus, a Greek philospher. One of the first machines to artificially produce it was called "the friction generator" developed by Otto von Guericke in the 17th century. Franklin presented it again to the public in 1750. See the related link for more information.
Can you activate the over discharging car battery?
Do you mean activate the battery when it won't work?
you can take it to the place you bought it
Where is the knowledge of dielectric strength helpful?
One field in which this is helpful is in the manufacture of insulating materials. Dielectric strength determines the strongest electric field an insulator can withstand before it fails. For example, if the insulation around a wire melts or breaks, the insulator's dielectric strength is compromised.
How will you show that electrons are negatively charged.name the instrument?
This instrument is the electrometer.
How do you derive coulombs law from gauss law?
As an example of the statement that Maxwell's equations completely define electromagnetic phenomena, it will be shown that Coulomb's Law may be derived from Gauss' law for electrostatics. Consider a point charge. We can obtain an expression for the electric field surrounding the charge. We surround the charge with a "virtual" sphere of radius , then use Gauss' law in integral form:
We rewrite this as a volume integral in spherical polar coordinates over the "virtual" sphere mentioned above, which has the point charge at its center. Since the electric field is spherically symmetric (by assumption) the electric field is constant over this volume.
Hence
Or
The usual form can then be recovered from the Lorentz force law, noting the absence of magnetic field.
How made the Jacobs ladder electricity?
I don't know, but i do know you need a massive @ss transformer!
What is the advantage and the disadvantage of static electricity on Industries?
I only know of disadvantages, it can cause severe damage in electronic equipment
And advantage is Static electricity can be used to temporarily bond materials together and or compress non conductive material.
200 yards to 200 feet is easy, just divide by three.
0.09 square inches means the new wire has about 1.9 times the cross-sectional area of the old one (assuming CM means circular mils). So that would reduce the resistance by a further factor of 1.9.
All told, I'm getting somewhere in the vicinity of 166 "m ohms" (milliohms?).
I did not understand .I'm talking Arabic
Why is the electric field considered a vector quantity?
Because to completely describe it you must know both how strong it is (magnitude) and in what direction it points.
"Without the size of the plates (and a little additional information), we're dead in the water on this. Charge density is charge (Q) divided by the area of the capacitor's plates (a)."
With some critical thinking, you can figure out the charge density without the size of the plates. I'm assuming you had the same physics problem I did, in which another part makes you assume you're at minimum separation, in which case you can use the formula for electric field between two equally and oppositely charged plates (E = sigma/epsilon_0, where sigma is charge density and epsilon_0 is permittivity of free space, 8.85*10^-12 F/m). Using this knowledge, as well as the idea that E = potential difference / separation (E = V/d). So you rearrange the first equation to solve for sigma and then use E = V/d with the values the problem gives you to solve (sigma = epsilon_0*V/d). Your question did not give a distance, so I hope the problem did...haha... Or it could have been like mine and made you solve for the minimum separation first, using the potential and the electric field that results in air becoming electrically conductive. In that case, you take the former value divided by the latter and you get the minimum separation and use that value as your distance.
What is the minimum voltage of an electrostatic discharge ESD that you can feel?
1500v
From ESD Association ESD Handbook ESD TR20.20 section 5.3.2.1:
"When people are charged with static electricity, they can release stored energy to conductive objects such as doorknobs and electronic circuits. This transfer of energy is called an electrostatic discharge. Sometimes the electrostatic discharge causes visible sparks, but more often, it is both unseen and unfelt. Electrostatic discharges can damage ESD sensitive components used in modern electronics.
Static electricity is a natural phenomenon that occurs in all climates and at all levels of relative humidity year round. Most people cannot feel an electrostatic discharge unless the static voltage is greater than 2000 volts. However, some electronic circuitry can be damaged by ESD that is less than 2000 volts. The damage can be done without people having any sensation of the ESD event.
When a wrist strap is worn properly and connected to ground, the person wearing it will stay near ground potential."
What is the net charge on the charged capacitor?
there is no net charge on the capacitor because nomber of positive and negative charge and negetive are equal.
How do you get rid of static electricity in photos?
Rub it off
Radioactive polonium brushes available in any photoshop will do this. The alpha particles emitted by the polonium ionize air and the ionized air carries off the static charge. These brushes should be bought new at least every year from a fresh batch at the photoshop due to the short halflife of polonium.
What happens when a bulb fuses?
It's not widely realised that incandescent lamps have a fuse element in series with the lamp base and the filament. This fuse is designed to prevent the lamp exploding in the event of a failure of the filament which results in it being short circuited.
What is the difference between electricity in a battery vs the electricity in an electrical outlet?
One is AC and the other is DC.
AC- alternating current is used in electrical outlets
DC- direct current is used in batteries.
An electrical outlet in your house would have 120 volts (the ones you use most, your tv, lights, radio are plugged into) or 240 volts (the ones your stove and dryer plug into).
A battery voltage varies widely: AA & AAA batteries have 1.5 volts, a 9 volt battery has 9 volts, your car battery has 12 volts.
Why cant conductors generate static electricity when rubbed together?
Static electricity causes electrons to move from one material to the other. In an insulator, these electrons can't flow back to equalise the charges, whereas in a conductor they can; so whilst they could conceivably generate static electricity, it would be lost as quickly as it was made.
The ability of opposite charges in static electricity is what's used when designing applications for it.
- Dust removal: There are some appliances that can eliminate dust from the air, like air purifiers. They use static electricity to alter the charges in the dust particles so that they stick to a plate or filter of the purifier that has an opposite charge as that of the dust (opposite charges attract each other).
This effect is also used in industrial smokestacks to reduce the pollution that they generate, altough they work in a very large scale, the effect is basically the same as the home air purifier.
- Photocopy: Copy machines use static to make ink get attracted to the areas where we need the information copied. It uses the charges to apply the ink only in the areas where the paper to be copied is darker (usually this means text or other information) and not where the paper is white, this process is called xerography.
- Car painting: To make sure a car's paint is uniform and that it will resist the high speeds and weather to protect the car's metal interior, it is applied with a static charge. The metal body of the car is submerged in a substance that charges it positively, and the paint is charged negatively with the paint sprayer.
This process ensures a uniform layer of paint, since when there is enough negative paint in the car the extra will be repelled by the paint already in the car.
It also ensures that the paint won't fall off, since the electrical attraction between the paint and the car is stronger than if it was just sprayed.
All of these processes use electronic circuits to generate and control the static charges generated. If you are interested in electricity and electronics, check out my electronic circuits for beginners site, where you will find simple circuits to get you started, When you have learned enough you can build your own practical static electricity circuits for your own use!
