What is the SI unit of modulus of elasticity of substance ?
Correct answer: A. Nm-2
- A. Nm-2
- B. Jm-2
- C. Nm-1
- D. Being a number it has no unit.
Explanation
Modulus of elasticity is stress divided by strain; strain has no unit, so its unit is the unit of stress, N m^-2, also called the pascal. Students may choose J m^-2 because joules involve force and distance, but modulus measures stress, not energy per area.
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