Define Electric Flux Class 12

Learn about electric flux and its importance in class 12 physics. Explore examples, case studies, and statistics to understand the concept better.


Electric flux is a crucial concept in the study of electricity and magnetism. In class 12 physics, students learn about electric flux and its significance in various applications. Let’s delve deeper into the definition and implications of electric flux.

What is Electric Flux?

Electric flux is a measure of the electric field passing through a given area. It is defined as the product of the electric field strength and the area vector perpendicular to the electric field. Mathematically, electric flux (Φ) is given by the formula:

Φ = E * A * cos(θ)

  • E: Electric field strength
  • A: Area vector
  • θ: Angle between the electric field and the area vector

Significance of Electric Flux

Electric flux helps in understanding the flow of electric field lines through a surface. It is used to calculate the strength of the electric field passing through a given area, which is essential in various fields like engineering, physics, and electronics.

Examples of Electric Flux

Consider a cube with an electric field passing through one of its faces. The electric flux through that face can be calculated by multiplying the electric field strength with the area of the face and the cosine of the angle between them. Another example is the electric flux through a closed surface, which can be used to determine the charge enclosed by the surface.

Case Studies

One of the most famous cases involving electric flux is Gauss’s Law, which states that the total electric flux through a closed surface is equal to the charge enclosed by the surface divided by the permittivity of free space. This law has numerous applications in the field of electromagnetism and helps in solving complex problems related to electric fields.

Statistics on Electric Flux

According to research, electric flux plays a significant role in the design and analysis of electrical systems. It is used in industries like telecommunications, power generation, and electronics to optimize the efficiency of electric circuits and devices.


Electric flux is a fundamental concept in physics that helps in understanding the behavior of electric fields. By studying electric flux in class 12, students can gain a deeper insight into the principles of electromagnetism and their practical applications in various industries.

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