Which of the following materials is used for making coils of standard resistances ?
Correct answer: D. Manganin
- A. Copper
- B. Nichrome
- C. Platinum
- D. Manganin
Explanation
Manganin has relatively high resistivity, a low temperature coefficient, and good long-term stability, making it suitable for standard resistance coils. Copper has much lower resistivity and a larger temperature effect.
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