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).
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