Gauss's law states that the total electric flux through a closed surface equals
A{'text': 'Q_inside × ε₀', 'label': 'A'}
B{'text': 'Q_inside / ε₀', 'label': 'B'}
C{'text': 'Q_inside / (4π ε₀)', 'label': 'C'}
D{'text': '2 × Q_inside / ε₀', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Q_inside / ε₀', 'label': 'B'}
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: NCERT Class 12 Physics, Ch 1 "Electric Charges and Fields", §1.9_
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