A large plane sheet carries a uniform surface charge density of 1.77 × 10⁻⁸ C/m². What is the electric field near it (ε₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻²)?
Correct answer B. 1.0 × 10³ N/C
Explanation
For an infinite sheet E = σ/2ε₀ = 1.77 × 10⁻⁸ / (2 × 8.85 × 10⁻¹²) = 1.0 × 10³ N/C. Using σ/ε₀ wrongly doubles the answer.
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