The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, l = Original length of the body, A = Cross-sectional area of the body, and E = Young's modulus for the material of the body)

• A. <img src="/_files/images/mechanical-engineering/strength-of-materials/84-15-1.png">
• B. <img src="/_files/images/mechanical-engineering/strength-of-materials/84-15-2.png">
• C. <img src="/_files/images/mechanical-engineering/strength-of-materials/84-15-3.png">
• D. <img src="/_files/images/mechanical-engineering/strength-of-materials/84-15-4.png">