A 20 g non-conducting cuboid lying at rest on a 25 degrees incline has a total charge of 8.0 × 10^-6 C. The friction coefficients between the cuboid and the incline are µ_s = 0.15 and µ_k = 0.080. If the setup lies in a horizontal electric field, what least electric field strength is required to keep the cuboid from sliding?

• A. 8.3 × 10³ N/C
• B. 7.3 × 10³ N/C
• C. 1.7 × 10³ N/C
• D. 1.6 × 10⁴ N/C