A conductor having surface density is embedded in a dielectric medium of permittivity. The electric field in the medium is E. If it is known that the pressure p on the conductor surface is equal to the electric energy density in the medium, then p (in SI unit)is given by

• A. σ²/(4π)
• B. σ/(4πε)
• C. σ²/(2ε)
• D. σ²/(2πε)

Answer: (C)

As the point is near to the conductor will act as infinite sheet
Electric field (E) is given by:
E = σ²/(2ϵ)