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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

Is non ohmic filament better than ohmic filament?

How can a filament give off heat without resistance?

Another Answer

The terms, 'ohmic' and 'non-ohmic' refer to whether or not a material obeys Ohm's Law. It has NOTHING to do with whether a filament is resistive or not!

Ohmic materials obey Ohm's Law; non-ohmic materials do not.

GSL incandescent lamps generally use a filament made of tungsten. If you were to apply a gradually-increasing voltage to that filament, and note the corresponding values of current and, then, plot the results in the form of a graph, you would find that the graph is a curve. For Ohm's Law to apply, the current must be proportional to voltage for variations in voltage and this is ONLY true for a straight-line graph. Tungsten, therefore, is non-ohmic and does not obey Ohm's Law.

Tungsten is chosen for lamp filaments because it can withstand very high temperatures without failing. This is the main reason that it is chosen, NOT because it is non-ohmic.

What kind of charge will a uncharged body develop when a positively charged body is brought in contact?

The uncharged body will become positively charged after being brought into contact with a positively charged body, as electrons will flow from the uncharged body to the positively charged body until they reach equilibrium.

What is Gauss theorem of electrostatics?

Gauss's theorem of electrostatics states that the net electric flux through a closed surface is proportional to the total charge enclosed by that surface. In mathematical terms, it can be expressed as Φ = Q/ε₀, where Φ is the electric flux, Q is the total charge enclosed, and ε₀ is the permittivity of free space.

Why would an object be neutral?

An object is neutral if it has an equal number of positively charged protons and negatively charged electrons, resulting in a net charge of 0. This balance of charges causes the object to be electrically neutral and not attracted to or repelled by other charged objects.

How can you charge copper rod by holding it and rubbing it?

By rubbing the copper rod with a cloth or your hands, you transfer electrons between the rod and the fabric through friction. This process creates a build-up of static charge on the surface of the rod, giving it a net positive or negative charge.

When you rub two balloons with wool and gets static do they attract?

Yes, when you rub two balloons with wool and create static electricity, the balloons will become charged. As a result of this charge, the balloons will then attract each other due to the electromagnetic forces between them.

What makes most everyday objects electrically neutral?

Most everyday objects are electrically neutral because they contain an equal number of positively charged protons and negatively charged electrons. This balance of charges results in no overall electric charge on the object.

Is photon have high binding energy or not?

Photons do not have binding energy since they are fundamental particles that do not experience the strong nuclear force that binds protons and neutrons in an atomic nucleus. Photons are massless particles that carry electromagnetic force and are not confined or bound within specific energy levels.

How is the pith-ball charged when it is repelled by glass rod?

When the glass rod is rubbed with a cloth, it acquires a positive charge by gaining electrons. When the charged glass rod is brought close to the pith ball, the negative charges in the pith ball are repelled, causing the pith ball to become positively charged by induction.

When is the force between electric charges maximum?

Force bw two stationary charged particles is directly proportional to product of charges and inversly proportional to square of distance bw them. So max force product of force should be max and distance bw the particle should b minimum.

Does chalk on a blackboard have an electrostatic charge?

Yes, chalk on a blackboard can acquire an electrostatic charge when written or moved on the surface, due to friction between the chalk and the board. This charge can attract or repel other objects nearby.

Is static electricity negative or positive?

A positive charge is built up which then wants to find a path to ground.

It can be either polarity. It just depends on how the charge is generated and what materials used to generate it.

What are the ways objects can obtain static electricity?

Objects can obtain static electricity through friction, where two objects rub against each other causing an exchange of electrons. They can also acquire static electricity through conduction, where they come into contact with a charged object and electrons are transferred. Finally, objects can gain static electricity through induction, where a charged object nearby causes the electrons within the object to redistribute.

What are the disadvantages of electrostatic printing?

· Electrostatic plotter use inkjet cartridges to print information onto paper, instead of using a pen to draw the required information like pen plotters, making electrostatic plotters a faster form of plotting.

As well, the quality of output is much richer than pen plotters, as they use ink to produce an output instead of standard pen ink.

Commercially, the uses for a electrostatic plotter are also far more viable than using a pen plotter. For example, creating a large poster would require both high quality and a small lead time (time between printing initiation and outputting result). A pen plotter can achieve both objectives, but electrostatic plotters can achieve them faster and with more quality, making them ideal for commercial printing.

What will happen if a negatively charged object is brought near a suspended positively charged object?

The positively charged object will be attracted towards the negatively charged object due to the electrostatic force between opposite charges. The suspended object may move closer to or even touch the negatively charged object, depending on the strength of the charges and the distance between them.

How will the electric field strength compare at a 2 m distance point charge?

The electric field strength decreases with distance from a point charge following an inverse square law. So at a distance of 2m from the point charge, the electric field strength will be weaker compared to when closer to the charge.

Why do charges appear on rubbing two objects together?

When two objects are rubbed together, electrons can move from one object to the other, causing one object to become positively charged and the other to become negatively charged. This transfer of electrons creates an imbalance of charge between the two objects, leading to the appearance of charges.

Why do people need to know how static electricity is formed?

Understanding how static electricity is formed is important because it helps us prevent unwanted phenomena like electric shocks, fires, and equipment damage. By knowing how static charges occur, we can take measures to discharge or neutralize them effectively. Additionally, knowledge about static electricity is essential in various industries such as manufacturing and electronics to ensure safety and proper operation of equipment.

Is it possible for an electric field to exist in empty space?

Yes, an electric field can exist in empty space as it is a fundamental property of space itself. The concept of an electric field describes how electrically charged particles interact with each other, even in the absence of matter.

What is one kind of evidence that static electricity happens?

Static charges build on every body. If enough charges build on body then static discharge happens when they came in contact.

Examples are attracting of paper pieces with comb , Xerox machine , Vandegraff generator etc.,

How does eliminating static electricity help or hinder the performance of a device?

Eliminating static electricity can help improve the performance of a device by reducing the risk of damage to sensitive components from electrostatic discharge. Static electricity can hinder device performance by causing malfunctions, errors, or premature failure of electronic components. Proper static control measures, such as grounding straps or antistatic mats, can prevent these issues.

Does static electricity have different colors?

Static electricity itself does not have color. However, when static electricity causes a spark or discharge, the visible light emitted may appear as a color due to the gases present in the air. The color of the spark usually depends on the specific gases surrounding the discharge.

Why do people working on electronic equipment have metal wires clipped to their bodies as they work?

Metal wires clipped to their bodies act as grounding straps to prevent the buildup of static electricity. This helps protect sensitive electronic components from being damaged by electrostatic discharge during the assembly or repair process.

HoW is Coulombs law similar to newtons law?

They are algebraically (mathematically) identical.

Both laws say that the force between two objects is proportional to the product
of how much of the same thing each one has, and inversely proportional to the
square of the distance between their centers, and that it acts along the line
between their centers.

The property that Coulomb's Law is interested in is electric charge, and Newton's Law
is interested in mass instead.

Past that, you can massage both Laws with the same operations from Geometry and
Calculus, and you get all the same kind of results ... pairs of equal, opposite, mutual forces
between two objects, acceleration, escape velocity, elliptical orbits around each other, etc.
With one highly-charged ping-pong ball and a bunch of slightly-charged ones, you could
set up a working model solar system that followed the laws of Newton and Kepler both.

The one giant, glaring difference is that with electric charges you can have forces
that either pull together or push apart, but, as far as we know now, with masses
you can only get attraction.

But that's a difference between charge and mass. It's got nothing to do with the Laws.
The laws are still identical.