Stress-strain graphs reflect Young's modulus as slope in Hooke's law

Steps:

• Hooke's law states stress = Y × strain, where Y is Young's modulus.
• Brass has lower Y than steel, so its stress-strain line has smaller slope.
• Both lines are straight through origin, with steel steeper.
• Graph B shows steel line above and steeper than brass line.

Why B is correct:

• Slope equals Y; steel's higher Y gives steeper line, matching lower Y for brass.

Why the others are wrong:

• A: Both lines have same slope, ignoring Y difference.
• C: Curved lines violate Hooke's law linearity.
• D: Brass line steeper, contradicting lower Y for brass.

Final answer: B