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The standard resistance coil are made of “manganin” because
  • a)
    Temperature coefficient of resistance remain constant
  • b)
    Temperature coefficient of resistance is very low
  • c)
    Temperature coefficient of resistance is very high
  • d)
    Temperature coefficient of resistance is moderate
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The standard resistance coil are made of “manganin” becaus...
 Answer :- b
Temperature coefficient of resistance is very low
 
For manganin, the temp coefficient of resistance is very low, and its resistivity is quite large. Due to which the resistance of the manganin wire remains almost unchanged with change in temperature. It is due to this fact; the wire of the manganin is used for making standard resistance coil.
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The standard resistance coil are made of “manganin” becaus...
Understanding Manganin and Its Use in Resistance Coils
Manganin is a copper-manganese alloy that is widely used in the manufacturing of standard resistance coils. Its unique properties make it an ideal choice for applications requiring accurate and stable resistance measurements.
Key Reasons for Using Manganin:
  • Temperature Coefficient of Resistance: Manganin has a very low temperature coefficient of resistance. This means that its resistance changes very little with temperature variations, ensuring that measurements remain consistent and reliable.
  • Stability: The stability of resistance values under varying environmental conditions is crucial for precision measurements. Manganin’s low temperature coefficient contributes to this stability.
  • Corrosion Resistance: Manganin is resistant to oxidation and corrosion, which enhances the longevity and durability of resistance coils, making them suitable for long-term use.
  • Mechanical Properties: Manganin possesses good mechanical strength, which allows it to be manufactured into fine wire forms without compromising its integrity.

Conclusion:
In summary, the choice of manganin for standard resistance coils is largely attributed to its low temperature coefficient of resistance. This characteristic ensures that the resistance remains almost constant despite temperature fluctuations, making it an essential material for precision measurement applications.
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The standard resistance coil are made of “manganin” becausea)Temperature coefficient of resistance remain constantb)Temperature coefficient of resistance is very lowc)Temperature coefficient of resistance is very highd)Temperature coefficient of resistance is moderateCorrect answer is option 'B'. Can you explain this answer?
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