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?

Question

The standard resistance coil are made of &#8220;manganin&#8221; 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?

Answer

Answer :- b

Solution :- The temperature co-efficient of resistance of manganin is very low. Hence its resistance is almost independent of temperature. Hence it is used in making standard resistances.

Answer

It is so because regular working of the device generates heat ie increase in temperature so since on increasing temperature the resistance increase therefore manganin is used since its temperature coefficient (alpha) is less.

Answer

Answer :- b

Solution :- The temperature co-efficient of resistance of manganin is very low. Hence its resistance is almost independent of temperature. Hence it is used in making standard resistances.

Answer

Reasons why the standard resistance coils are made of manganin:

Low Temperature Coefficient of Resistance:
- Manganin has a very low temperature coefficient of resistance, which means that its resistance does not change significantly with temperature variations.
- This property is crucial for resistance coils used in precision instruments and applications where stable resistance is required.

Stable Performance:
- Due to its low temperature coefficient of resistance, manganin ensures a stable and predictable performance over a wide range of temperatures.
- This stability is essential for accurate measurements and reliable operation of electronic circuits.

High Resistivity:
- Manganin has a relatively high resistivity compared to other materials used for resistance coils, allowing for the creation of coils with high resistance values in a compact form.
- This high resistivity helps in achieving the desired resistance values without the need for long and bulky coils.

Longevity:
- Manganin is a durable and long-lasting material, making it suitable for use in resistance coils that are expected to have a long operational life.
- Its resistance properties remain consistent over time, ensuring the reliability of the resistance coil.

Conclusion:
In conclusion, the choice of manganin for standard resistance coils is primarily due to its low temperature coefficient of resistance, which provides stability, accuracy, and longevity to the resistance coils used in various electronic and electrical applications.

Similar Class 12 Doubts

Manganin and constantan have a low temperature coefficient of resistivity which means that

We use alloys for making standard resistors because they have

1) For alloys value of temperature coefficient is very high (true/fals e) 2) for metallic conductors the value of temperature coefficient of resistance is negative (true/false)?

For alloys the value of temperature coefficient of resistance is very high. (TrueI Fals e)?

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