Consider a plane surface of area 50 mm² in a uniform electric field of magnitude 25 N/C. The angle between the electric field and the normal to the surface is φ. Determine the values of angle φ for which the electric flux magnitude through the surface is i) maximum or ii) minimum.

• A. i) φ = 0° ; ii) φ = 45°
• B. i) φ = 0° ; ii) φ = 90°
• C. i) φ = 45° ; ii) φ = 90°
• D. i) φ = 90° ; ii) φ = 0°

Answer: (B)