Practice question

Given: A uniform field E = 5 × 10³N/C is along the x-axis. What is the net flux through a cube of side 30 cm with faces parallel to coordinate planes? Formula: Flux through face at x = 0 : phi = E × A = 5 × 10³ × (0.3)² = 450 Nm²/C (inward). Substitution & Calculation: Flux through face at x = 0.3 : 450 Nm²/C (outward). Net flux: 450 - 450 = 0 Nm²/C (no charge enclosed). Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.