NEET 2019 Odisha · PhysicsGauss fluxPrevious Year Question
A sphere encloses an electric dipole with charges ±3 × 10⁻⁶ C. What is the total electric flux across the sphere?
Answer: (B) zero. Answer: (b) Solution: By Gauss's law, total flux Φ = q_enclosed / ε₀.
- A.−3 × 10⁻⁶ N m²/C
- B.zero✓
- C.3 × 10⁻⁶ N m²/C
- D.6 × 10⁻⁶ N m²/C
Correct Answer
(B) zero
Solution & Explanation
Answer: (b) Solution: By Gauss's law, total flux Φ = q_enclosed / ε₀. A dipole consists of equal and opposite charges +q and −q. The net charge enclosed by the sphere = (+3 × 10⁻⁶) + (−3 × 10⁻⁶) = 0. Therefore Φ = 0 / ε₀ = 0. Hence the total flux is zero — option (b).
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