Which one of the following physical quantities does not have the dimensions of force per unit area ?
Correct answer: B. Strain
- A. Stress
- B. Strain
- C. Youngs modulus
- D. Pressure
Explanation
Stress, Young's modulus and pressure are all force per unit area, with dimensions M L^-1 T^-2. Strain is extension divided by original length, so it is dimensionless and does not have force-per-area dimensions.
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Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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