Which of the following substances posses the highest elasticity ?
Correct answer: B. Steel
- A. Rubber
- B. Steel
- C. Glass
- D. Copper
Explanation
Elasticity in this comparison is measured by Young's modulus, and steel has a much larger Young's modulus than rubber, copper or ordinary glass. Rubber, the likely mistaken choice, undergoes larger extension and is therefore more flexible, but greater flexibility means lower elasticity in this physics definition.
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About Resistance and Resistivity
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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