Final answer:
The surface charge density on the face of the penny is approximately 1.593 × 10^-8 C/m².
Step-by-step explanation:
The surface charge density on the face of the penny can be calculated using the formula:
σ = ε₀ * E
where σ is the surface charge density, ε₀ is the vacuum permittivity, and E is the electric field strength.
Given that the electric field strength is 1800 N/C, we can substitute this value into the formula:
σ = (8.854 × 10^-12 C²/N*m²) * 1800 N/C = 1.593 × 10^-8 C/m²
Therefore, the surface charge density on the face of the penny is approximately 1.593 × 10^-8 C/m².