What electric charge is
Electric charge is a property of matter. Some particles have positive charge, some have negative charge, and some have no charge. Protons are positive, electrons are negative, and neutrons are neutral.
Like charges repel each other. Opposite charges attract each other. This simple rule creates a huge part of the physical world, from atoms to electrical machines.
Positive and negative charge
| Pair | Result | Meaning |
|---|---|---|
| Positive and positive | Repel | They push away from each other |
| Negative and negative | Repel | They push away from each other |
| Positive and negative | Attract | They pull toward each other |
| Neutral object near charge | Can be attracted | Charge inside the object can shift slightly |
What an electric field means
An electric field is the influence around a charge. If another charge enters that region, it feels a force. The field helps explain how one charged object can affect another without touching it.
A field is like a map of possible force. It tells what would happen to a small positive charge placed at each point in space.
Static electricity
Static electricity happens when charge builds up on surfaces. Rubbing materials can move electrons from one surface to another. One object becomes more negative and the other becomes more positive.
The small shock from touching a metal object after walking on carpet is a discharge. Charge that was separated suddenly finds a path to balance.
Charge in atoms
Atoms are usually neutral because the number of protons and electrons is balanced. If an atom gains or loses electrons, it becomes an ion. This matters in chemistry, batteries, the human body, and many sensors.
Fields and conductors
In a conductor, electrons can move more easily. When an electric field is applied, many electrons respond. This response allows current to flow through metals and many electrical components.
This formula shows the basic force between two charges. The force grows with charge size and becomes weaker as distance increases.
Static electricity is usually small, but electrical discharge can damage electronics and can be dangerous in places with flammable vapor or sensitive equipment.
Frequently asked questions
Yes. A charged object can shift charges inside a neutral object, creating attraction even when the total charge is balanced.
Start with the full electricity overview before studying fields in more detail.