A concrete beam of rectangular cross section of 200 mm ×

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A concrete beam of rectangular cross section of 200 mm × 400 mm is prestress with a force 400 kN at eccentricity 100 m. The maximum compressive stress in the concrete is

1. 12.5 N/mm²
2. 7.5 N/mm²
3. 5.0 N/mm²
4. 2.5 N/mm²

Correct Option: A

σ_min =	P	-	P_e
	A		Z