Short Answer

Electric charge is a basic property of matter that causes objects to attract or repel each other. It exists in two types — positive charge and negative charge. Like charges repel each other, while unlike charges attract. Electric charge is carried by particles such as electrons (negative) and protons (positive).

Electric charge is measured in coulombs (C). It plays an important role in electricity, electric circuits, lightning, and the working of many electronic devices. Without electric charge, electrical forces and electric energy would not exist in nature.

Detailed Explanation :

Electric Charge

Electric charge is one of the most fundamental concepts in physics and forms the basis of electricity and electromagnetism. It is a physical property of particles that allows them to experience electric force. All matter around us is made of atoms, and inside these atoms are particles that carry electric charge. When an object has an imbalance of charges, it becomes electrically charged.

Electric charge influences how particles interact with each other. It creates electric fields, produces electric forces, and is responsible for many natural and technological phenomena. From lightning in the sky to the working of batteries and electric circuits, electric charge plays a central role.

Types of Electric Charge

There are two types of electric charge:

1. Positive Charge

Carried by protons, which are present in the nucleus of an atom.

2. Negative Charge

Carried by electrons, which revolve around the nucleus.

These two charges interact according to a simple rule:

• Like charges repel each other.
• Unlike charges attract each other.

This attraction and repulsion produce electric force, which is a basic force in nature.

Nature of Electric Charge

Electric charge has several important characteristics:

1. Quantization of Charge

Charge exists in small packets. The smallest unit of charge is the charge of an electron or proton, which is .
All charges are whole-number multiples of this value.

2. Conservation of Charge

Electric charge cannot be created or destroyed. It can only be transferred from one object to another. When a body gains electrons, it becomes negatively charged; when it loses electrons, it becomes positively charged.

3. Additivity of Charge

Total charge of a system is the algebraic sum of all individual charges.

4. Charge Creates Electric Field

A charged body produces an electric field around it, which influences other charges nearby.

How Objects Become Charged

Objects can gain or lose charge through several processes:

1. Friction (Rubbing)

When two objects are rubbed together, electrons may transfer from one to the other.
Example: Rubbing a balloon on hair makes the balloon charged.

2. Conduction (Touching)

A charged object can transfer charge to another object by direct contact.

3. Induction (Without Contact)

A charged object can cause another object to become charged without touching it.

These processes are used in many technologies, such as printers, photocopiers, and electrostatic machines.

Measurement of Electric Charge

Electric charge is measured in coulombs (C).
One coulomb is a very large amount of charge.

In daily life, charges on objects are usually much smaller, measured in microcoulombs (µC) or nanocoulombs (nC).

Electric Charge in Atoms

Atoms are electrically neutral because:

• Number of protons = Number of electrons

If an atom gains electrons → it becomes negatively charged (anion).
If an atom loses electrons → it becomes positively charged (cation).

This movement of electrons is the basis of electricity.

Role of Electric Charge in Electricity

Electric circuits work because electrons (which carry negative charge) move through wires. This flow of charge is known as electric current. Batteries, generators, and power sources work by creating a difference in charge, causing electrons to move.

Electric Forces and Coulomb’s Law

Charged objects exert forces on each other, described by Coulomb’s law, which states:

The electric force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

This law helps us calculate how strong the force between two charges will be.

Electric Charge in Daily Life

Electric charge plays a role in many common phenomena:

• Lightning is a giant discharge of electric charge.
• Static electricity makes clothes stick after drying.
• Printers use electric charge to arrange ink.
• Touch screens work using electric charges from fingers.
• Electric motors and machines operate because of charge movement.

Thus, electric charge is essential in natural processes and modern technology.

Conclusion

Electric charge is a fundamental property of matter responsible for electric forces, electric fields, and the flow of current. It exists in two types—positive and negative—and is carried by protons and electrons. Charge is conserved, quantized, and measurable in coulombs. It forms the basis for electricity, electronic devices, chemical reactions, and many everyday phenomena. Understanding electric charge helps us understand how the electrical world around us functions.