# ELECTRIC CHARGE AND FIELDS

• killershek
In summary, electric charge is a fundamental property of matter that can be either positive or negative and is measured in coulombs. It is created by the movement of electrons between atoms and can be represented by electric field lines. There are two types of electric charge, and their interaction is described by the inverse square law, where the strength of the electric field decreases with distance.
killershek
In case of wire(having uniform linear charge density), without assuming the wire infinite long, why we can't take electric field perpendicular to the curved part of the cylindrical Gaussian surface?

Hello hek,

There's also field lines going in the direction along the cylinder (except in the symmetry plane perpendicular to the axis).

From very far away such a wire should look like a point charge and have the corresponding field. Only close by, the difference between infinitely long and just long is minimal.

## 1. What is electric charge?

Electric charge is a fundamental physical property of matter that causes it to experience a force when placed in an electromagnetic field. It is measured in units of coulombs (C) and can be either positive or negative.

## 2. How is electric charge created?

Electric charge is created by the movement of electrons, which are negatively charged particles, from one atom to another. This can happen through processes such as friction, conduction, and induction.

## 3. What are the two types of electric charge?

The two types of electric charge are positive and negative. Like charges repel each other, while opposite charges attract each other.

## 4. What is an electric field?

An electric field is a region in space where an electrically charged particle experiences a force. It is created by electric charges and can be represented by electric field lines, which point in the direction of the force on a positive charge.

## 5. How does distance affect the strength of an electric field?

The strength of an electric field decreases as distance from the source charge increases. This relationship is described by the inverse square law, which states that the strength of the electric field is inversely proportional to the square of the distance from the source charge.

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