In the strain formula e = d/L, what does e represent?

In the strain formula e = d/L, what does e represent?

• A. Original length
• B. Total elongation
• C. Strain
• D. Elastic modulus

Answer: (C)

The main idea is that strain represents the fractional change in length. In the formula e = d/L, d is the change in length (how much the object stretches or compresses) and L is the original length before loading. So e is the ratio of the length change to the original length, a dimensionless quantity. If you multiply by 100%, you get percent strain. The total elongation would be d alone, and the original length is L, not e. Elastic modulus is a separate property that links stress to strain (E = σ/ε), not what this expression directly defines.

The main idea is that strain represents the fractional change in length. In the formula e = d/L, d is the change in length (how much the object stretches or compresses) and L is the original length before loading. So e is the ratio of the length change to the original length, a dimensionless quantity. If you multiply by 100%, you get percent strain. The total elongation would be d alone, and the original length is L, not e. Elastic modulus is a separate property that links stress to strain (E = σ/ε), not what this expression directly defines.