STANDARD Physics Electric Flux MCQ Question
A point charge +20 μC is at a distance 6 cm directly above the centre of a square of side 12 cm as shown in figure. The magnitude of electric flux through the square is
2.5 × 10⁶ N m² C⁻¹
3.8 × 10⁵ N m² C⁻¹
4.2 × 10⁵ N m² C⁻¹
2.9 × 10⁶ N m² C⁻¹
Correct Answer
Detailed Explanation
From figure, it is clear that square ABCD is one of the six faces of a cube of side 12 cm. By Gauss's theorem, total electric flux through all the six faces of the cube = q/ε₀. Electric flux through the square = (1/6) × (q/ε₀) = (1/6) × (20 × 10⁻⁶ / 8.85 × 10⁻¹²) = 3.8 × 10⁵ N m² C⁻¹.
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