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Field due to an infinite uniformly charged plane sheet of surface charge density σ is
Aσ/(2ε₀)
Bσ/ε₀
Cσε₀
Dσ²/ε₀
Answer & Solution
Correct answer: A. σ/(2ε₀)
1. Take a cylindrical Gaussian pillbox piercing the sheet with area A.
2. Flux escapes from both flat faces: 2EA = σA/ε₀.
3. Hence E = σ/(2ε₀); the field is uniform and independent of distance from the sheet.
_Source: Maharashtra Balbharati Std XII Physics, Ch 8 "Electrostatics" §8.2.4_
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