Two large parallel plates carry equal and opposite charge densities of magnitude 8.85 × 10⁻⁸ C/m². What is the electric field between them (ε₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻²)?
Correct answer B. 1.0 × 10⁴ N/C
Explanation
Between oppositely charged plates the fields of both sheets add: E = 2 × σ/2ε₀ = σ/ε₀ = 8.85 × 10⁻⁸ / 8.85 × 10⁻¹² = 1.0 × 10⁴ N/C.
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