The dimension of elastic modulus is ___________________ ?
Correct answer: A. ML-1T-2
- A. ML-1T-2
- B. ML-2T-2
- C. MLT-2
- D. ML2T-2
Explanation
Elastic modulus is stress divided by strain, and strain has no dimensions. Stress is force per area, so its dimensions are (MLT^-2)/L² = ML^-1T^-2. ML^-2T^-2 is a likely mistake from dividing force by volume instead of area.
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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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