Electric Flux is a key concept in Class 12 Physics (Electric Charges and Fields chapter), central to understanding Gauss's Law.
Symbol: Φ (Phi).
SI Unit: N·m²/C or V·m (both correct).
Formula: Φ = E·A·cosθ.
Gauss's Law: Φ = Q/ε₀.
Electric Flux (Φ) measures the total number of electric field lines passing through a given surface area.
Formula: Φ = E × A × cos θ
The SI unit of Electric Flux is:
Volt-metre (V·m) or equivalently Newton-metre² per Coulomb (N·m²/C).
Both are correct and acceptable:
Gauss's Law: The total electric flux through a closed surface is equal to the total charge enclosed divided by the permittivity of free space (ε₀).
Φ = Q/ε₀
The SI unit of electric flux is Newton-metre squared per Coulomb (N·m²/C), which is also equal to Volt-metre (V·m).
Electron Volt — Unit of Energy in Atomic Physics
Learn why the electron volt (eV) is a unit of energy. Find its definition, exact value in Joules, and why it is used in atomic and nuclear physics.
Define Electrostatic Potential
Learn the exact definition of electrostatic potential. Understand the formula, SI unit (Volt), and the concept of bringing a test charge from infinity.
Difference Between EMF and Potential Difference
Understand the exact difference between Electromotive Force (EMF) and Potential Difference in an electrical circuit. CBSE Class 12 Physics.
What is the Equation of Trajectory in Projectile Motion?
Learn the Equation of Trajectory for projectile motion in physics. Understand the y = x tan(θ) formula and why the path of a projectile is a perfect parabola.
What is an Erect Image in Optics?
Learn the definition of an Erect Image in physics. Understand the difference between an erect virtual image (like in a plane mirror) and an inverted real image.
Turn this guide into revision flashcards, a practice exam, or an AI-generated podcast — free, no signup required.