# Electric charge attraction and repulsion

• carbrook
In summary, the basic law of electric charge fields is that like charges repel and unlike charges attract. This is based on empirical observation and is described using the Coulomb's law, which states that the force with which the attraction or repulsion takes place is the same and is determined by the likeness or unlikeness of the charges. This law is different from the universal law of gravitation, which always results in an attractive force. String theory, however, is not relevant in explaining these phenomena and is not the answer to this question.
carbrook
The basic law of electric charge fields is that like charges repel and unlike charges attract. This does not come out of the equations but is inserted as just an empirical observation that must be allowed for, is it not ? Am I missing something here? Compare gravity that is always an attractive force. Will this fall out of the superstring theory of everything?

String theory has NOTHING to do with this. Essentially, classical physics describes these phenomena, it does not explain why the gravitational force is attractive ! That's an important nuance that needs to be made here.

marlon

In the simplest terms, the sign of the potential energy determines the direction of the force. In the electric case, this is proportional to the product of two charges, which may be positive or negative in sign. Like charges give positive potential energy ( repulsive force) and unlike charges give negative potential energy (attractive force).

We only know one 'charge' for mass, so that makes it different.

It is not actually as arbitrary as you suggest when you say -

This does not come out of the equations but is inserted as just an empirical observation that must be allowed for, is it not ?

And forget string theory, it is is not the answer.

Like charge repel and unlike charges attract. The force with which the attraction or repulsion takes place is the same and is given by the Coulomb's law. The forces directions come from the likeness or unlikeness of the charges. The magnitude/directionof the forces every thing is based on the empirical observation and is described using an equation.

## 1. What is electric charge?

Electric charge is a fundamental physical property of matter that causes objects to experience a force when placed in an electric field. It can be positive or negative and is measured in Coulombs (C).

## 2. How does electric charge attraction and repulsion occur?

Electric charge attraction occurs when particles with opposite charges are attracted to each other, while electric charge repulsion occurs when particles with the same charge repel each other. This is due to the exchange of virtual photons between charged particles.

## 3. What is the role of electrons in electric charge attraction and repulsion?

Electrons are negatively charged particles that are responsible for most electric charge interactions. They can be easily transferred between atoms, resulting in the attraction or repulsion of objects.

## 4. What are some real-life examples of electric charge attraction and repulsion?

Some common examples include the attraction between a balloon and hair after being rubbed on a sweater, the repulsion between two magnets with the same poles facing each other, and the attraction between positive and negative charges in an electrical circuit.

## 5. How can electric charge attraction and repulsion be used in technology?

Electric charge attraction and repulsion are essential in many technologies, such as generators, motors, and batteries. They are also crucial in the function of electronic devices, such as computers and smartphones.

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