Copper, even though costly, finds use in the windings of electrical machines because_____________?
Correct answer: D. all of the above
- A. copper points offer low contact resistance
- B. copper can be easily soldered and welded
- C. copper windings are less bulky and the machines become compact
- D. all of the above
Explanation
Copper combines very high conductivity with good solderability and weldability, while its low resistivity permits smaller, less bulky windings. These benefits explain its use despite its higher cost, so all listed reasons apply.
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