Final answer:
The student's question concerns calculating the electric field, charge density, and potential difference for charged conductors and applying electrostatic principles.
Step-by-step explanation:
The question involves the concept of electric fields and charge distribution in Physics, specifically relating to electrostatics and the properties of charged conductors. When discussing the magnitude and direction of the electric field between charged parallel plates, such as the mentioned plates with an area of 0.75 m² and charges of ±0.225 C, we use the formula E = σ / ε₀, where E is the electric field, σ is the surface charge density and ε₀ is the vacuum permittivity. Moreover, questions about electric potential, charge density, and potential difference reflect other key concepts related to electric fields in Physics. The answers to these questions involve using fundamental physics formulas to calculate the desired quantities.