Which of the following variety of copper has the best conductivity ?
Correct answer: C. Pure annealed copper
- A. Induction hardened copper
- B. Hard drawn copper
- C. Pure annealed copper
- D. Copper containing traces of silicon
Explanation
Pure annealed copper has the highest conductivity because it contains very few resistivity-increasing impurities and has a soft, recrystallised structure. Hard drawing and alloying introduce effects that increase resistance.
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