alleryGauss's law states that the total electric flux through a closed surface equals
AQ_inside × ε₀
BQ_inside / ε₀
CQ_inside / (4π ε₀)
D2 × Q_inside / ε₀
Answer & Solution
Correct answer: B. Q_inside / ε₀
1. Gauss's law: ∮ E · dA = Q_enclosed / ε₀.
2. Only the charge enclosed by the Gaussian surface matters.
3. External charges contribute zero net flux through the surface.
4. It simplifies field calculations under symmetry (spherical, cylindrical, planar).
_Source: syllabus Physics, Ch 1 "Electric Charges and Fields", §1.9_
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