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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

How does a electroscope detect a electric charge?

An electroscope detects an electric charge by using the principle of electrostatic induction. When a charged object comes near the electroscope, it induces a separation of charge within the electroscope, causing the leaves to either repel or attract each other depending on the type of charge present. This movement of the leaves indicates the presence and type of electric charge.

Can you light a fluorescent bulb with static electricity?

Yes, you can flash a fluorescent tube with static electricity. Once the static potential difference is equalized the tube will go out.

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Static electricity is discharged with a spark in a fraction of a second. Florescent bulbs stay on for long periods of time. Perhaps it could operate a strobe light one time every few minutes. A strobe light does not provide enough light to be useful for anything except photography and dancing at a club!

What happens when a positively charged body is brought close to gold leaf electroscope?

When a positively charged body is brought close to a gold leaf electroscope, the electrons in the electroscope will be repelled towards the top of the leaves, causing them to diverge. This happens because like charges repel each other, and the positive charge on the body repels the electrons in the electroscope leaves.

Why does a helicopter generate static electricity?

Helicopters generate static electricity due to the friction between the rotor blades and the surrounding air. This friction causes a build-up of electric charge on the blades, which can discharge as a spark when the helicopter lands or when personnel come in contact with it. Grounding systems are used to prevent static electricity build-up on helicopters.

How are static electicity and current electricity alike?

Static electricity and current electricity are both forms of electrical energy. They both involve the movement of electrons, but in static electricity, the charges accumulate on an object and do not flow, while in current electricity, the charges continuously flow in a circuit.

How can static electricity be created?

Static electricity is created when two materials rub against each other, causing electrons to move from one material to the other. This imbalance of electrons results in a buildup of static charge on the surfaces of the materials, which can then discharge as a spark or shock when they come into contact with a conductor.

What is the name for a form of stationary electricity?

The form of stationary electricity is called static electricity. It occurs when there is an imbalance of electric charges on the surface of an object.

What is the value of relative permittivity for insulating materials?

The value of relative permittivity for insulating materials is typically in the range of 2 to 10. This value indicates the material's ability to store electrical energy when an electric field is applied. Higher values of relative permittivity indicate better insulating properties.

What are the rules of static charge?

Static charge is the imbalance of electric charge on an object. Objects become statically charged when electrons are transferred between two objects through friction. Like charges repel each other, while opposite charges attract. Static charge can build up on insulating materials and can be discharged through a spark if the potential between two objects is high enough.

What is meant by electrostatic shielding?

Electrostatic shielding is a technique used to prevent electric fields from penetrating or affecting a specific area by surrounding it with conductive materials. This is commonly used in electronic devices to protect sensitive components from external interference and to ensure proper functioning. The conductive material acts as a barrier to redirect or absorb the electric fields, reducing the impact on the protected area.

Why does the gold leaf on an electroscope lift when a charged object is brought near?

The gold leaf on an electroscope lifts when a charged object is brought near because the like charges repel each other. The charged object induces a charge separation in the electroscope, causing the gold leaf to become charged and repel away from the object.

Why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field?

The electrostatic potential is a scalar quantity that represents the potential energy of a unit positive charge at a specific point in the electric field. It is defined as the work done in moving a unit positive charge from infinity to that point. This potential does not depend on the path taken and can be defined at any point in a region of space regardless of the presence of an electric field.

How the cells of same emf can be connected to get large value of emf?

They are connected in 'series', the negative terminal of one cell connected to the

positive terminal of the next cell, and so on with as many cells as you have, so that

there is only one path for current through the entire combination of cells.

In this configuration, the EMF of the combination is the sum of the individual EMFs, but

the combination can't deliver any more current (amperes) than any single cell can.

How capacitor deliver electrical energy constantely?

A capacitor can't deliver electrical energy 'constantly'. Much like a battery, electrical

energy can be stored in it, and then delivered later.

The capacitor only stores some definite amount of energy ... equal to 1/2 of its capacitance

multiplied by the square of the voltage to which it's charged ... and later, after it has

delivered that amount of energy, it delivers no more without being charged again.

What will happen when two balloons are brought together right after they are rubbed on a piece of wool?

When you rub one balloon with wool, and then rub another balloon with wool,

we can safely assume that both balloons acquire the same kind of charge. So

when you try to bring them together, they'll repel each other (push apart).

Do lasers on run electricity?

If you are asking "Do lasers run on electricity?" Then the answer would be "Yes, Most of them do."

Is plastic ruler gets attracted towards pieces of paper when rubbed with oily hair?

Yes, when a plastic ruler is rubbed with oily hair, it can become statically charged. This static charge may attract lightweight objects like pieces of paper due to the electrostatic force between the ruler and the paper.

How are current and static electricity related?

Current electricity is the flow of electrons through a conductor, while static electricity is the buildup of electric charge on an object. Both are manifestations of the fundamental force of electromagnetism. Static electricity can discharge to become current electricity under certain conditions.

How does electrostatic forces prevents the nanoparticles to aggregate?

Electrostatic forces repel the nanoparticles from each other due to their like charges, preventing them from aggregating. This repulsion helps maintain the stability and dispersion of the nanoparticles in a solution by keeping them evenly distributed and separate.

What did you mean by surface integral of electric field?

It means that a surface is divided into many small pieces, the area of each piece is multiplied by a quantity (for example, the electric field - possibly a vector multiplication), and everything is added up in the end.

How is an electrostatic filter cleaned?

An electrostatic filter can be cleaned by using a high power suction device to pull the contaminants from the filter mess itself, for best results apply suction to both sides preferably once a month. If less frequent cleaning or heavy usage of the filter results in a large build up of waste, after the first round of suction, wash the filter in clean warm soapy water and allow to air dry.

When area is held perpendicular to the field lines then the magnitude of electric flux is?

When the area is perpendicular to the field lines, the magnitude of electric flux is given by the product of the electric field strength, the area of the surface, and the cosine of the angle between the field lines and the normal to the surface. This is known as Gauss's Law for electric fields.

What is the coulombs force between two point charges placed in different mediums?

The Coulomb's force between two point charges placed in different mediums depends on the electric permittivity of the mediums. The force magnitude is inversely proportional to the square of the distance between the charges and directly proportional to the product of the charges. The presence of different mediums alters the force based on their respective dielectric constants.

Is lightning is an example of static electricity true or false?

True. Lightning is a natural example of static electricity, which occurs when there is a build-up of electrical charge in the atmosphere that discharges in the form of a lightning bolt.

Can a electrically-charge object attract uncharged object?

Yes, and in fact they do. You can easily see this yourself by rubbing a balloon on a sweater and then "sticking" it to a wall.

This happens because of something called "induced dipoles".

Let's say you have an electrically charged object ... negatively charged, for example.

If you bring it near an uncharged object, what happens is that the electrons in the molecules of the uncharged object tend to be repelled by the charged object. They move as far to the opposite side as they can get.

Because the electromagnetic force gets smaller with distance, the uncharged molecules now have a slight net attraction to the charged object, since the part of the molecule that's attracted to the charged object is now closer to the charged object than the part of the molecule that's repelled by it. This means the attractive force is very slightly greater than the repulsive force. For any individual molecule, it's not much, but there are a LOT of molecules in any object large enough to see, and those tiny attractions add up.