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FAQs on Electric Flux - Theory Sheet, Class 12 Physics

1. What is electric flux?
Ans. Electric flux is a measure of the total number of electric field lines passing through a given area. It is the product of the electric field strength and the area perpendicular to the field.
2. How is electric flux calculated?
Ans. Electric flux can be calculated by multiplying the electric field strength by the area of the surface perpendicular to the electric field. Mathematically, it is represented as Φ = E * A, where Φ is the electric flux, E is the electric field strength, and A is the area.
3. What is the SI unit of electric flux?
Ans. The SI unit of electric flux is volt meters squared per coulomb (V·m²/C). It is a derived unit obtained from the basic SI units of electric field (V/m), area (m²), and charge (Coulomb).
4. What is Gauss's law in relation to electric flux?
Ans. Gauss's law relates the electric flux through a closed surface to the charge enclosed within the surface. It states that the total electric flux through a closed surface is proportional to the total charge enclosed by that surface. Mathematically, it is represented as Φ = q/ε₀, where Φ is the electric flux, q is the total charge enclosed, and ε₀ is the permittivity of free space.
5. How does the electric flux change with the angle between the electric field and the surface?
Ans. The electric flux is maximum when the electric field lines are perpendicular to the surface (θ = 0°) and minimum when the electric field lines are parallel to the surface (θ = 90°). The electric flux is given by the equation Φ = E * A * cos(θ), where θ is the angle between the electric field and the surface.
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