NEET 2023 Phase 2 · PhysicsGauss fluxPrevious Year Question
A charge Q µC is placed at the centre of a cube. The flux coming out from any one of its faces will be (in SI unit):
Answer: (B) (Q × 10⁻⁶) / (6ε₀). Answer: (b) Solution: By Gauss's law, total flux through the closed cube = q_enclosed / ε₀.
- A.(Q × 10⁻³) / (6ε₀)
- B.(Q × 10⁻⁶) / (6ε₀)✓
- C.(Q × 10⁻⁶) / ε₀
- D.(3Q × 10⁻³) / (2ε₀)
Correct Answer
(B) (Q × 10⁻⁶) / (6ε₀)
Solution & Explanation
Answer: (b) Solution: By Gauss's law, total flux through the closed cube = q_enclosed / ε₀. The charge is Q µC = Q × 10⁻⁶ C, so total flux = (Q × 10⁻⁶) / ε₀. By symmetry (charge at the centre), this flux is shared equally among the 6 faces. Flux through one face = (1/6) × total = (Q × 10⁻⁶) / (6ε₀). Hence option (b).
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