MCQ practice · SSC Physics Board questions · Chapter 11: Current Electricity
What is the specific resistance of copper?
Think it through first, then pick an option.
- a 1.6 × 10⁻⁸ Ωm
- b 1.68 × 10⁻⁸ Ωm
- c 2.44 × 10⁻⁸ Ωm
- d 5.5 × 10⁻⁸ Ωm
Answer and explanation
Correct answer: b 1.68 × 10⁻⁸ Ωm
By Table 11.01 the specific resistance of copper is 1.68×10⁻⁸ Ω m.
Why the other options are wrong
- a 1.6 × 10⁻⁸ Ωm: 1.6×10⁻⁸ Ω m is the silver value of the book's example; the table gives copper as 1.68×10⁻⁸ Ω m.
- c 2.44 × 10⁻⁸ Ωm: 2.44×10⁻⁸ Ω m is the value for gold; copper is 1.68×10⁻⁸ Ω m.
- d 5.5 × 10⁻⁸ Ωm: 5.5×10⁻⁸ Ω m is the tungsten value of the book's example; copper is 1.68×10⁻⁸ Ω m.
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