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The resistivity of alloy manganin is
- a)Nearly independent of temperature
- b)Increases rapidly with increase in temperature
- c)Decreases with increase in temperature
- d)Increases rapidly with decrease in temperature
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
The resistivity of alloy manganin isa)Nearly independent of temperatur...
Metals, including alloys, have free electrons as charge carriers. Their movement controls by defects. One of defects of usual metal is oscillations of atoms due to temperature. More temperature - more oscillations - more collisions of electrons with atoms - less mobility - more resistivity. In alloys, like constantan, atoms are in disorder so alloys have big resistivity. Their additional disorder due to temperature increase is insignificant. That is why alloys have no temperature dependence of resistivity. The same picture is with metal glasses.
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The resistivity of alloy manganin isa)Nearly independent of temperatur...
Resistivity of Alloy Manganin
The resistivity of alloy manganin is nearly independent of temperature. Let's understand why this is the case:
Composition of Manganin
- Manganin is a copper-nickel-manganese alloy known for its high resistivity.
- The composition typically consists of around 84% copper, 12% manganese, and 4% nickel.
Effect of Temperature on Resistivity
- In most materials, the resistivity tends to increase with an increase in temperature. This phenomenon is known as temperature coefficient of resistance.
- However, manganin is unique in this aspect. Due to its specific composition and crystal structure, the resistivity of manganin remains nearly constant over a wide range of temperatures.
- This property makes manganin suitable for applications where stable resistance values are required despite changes in temperature.
Reasons for Temperature Independence
- The constant resistivity of manganin can be attributed to the balanced effects of the temperature coefficients of resistivity of its constituent metals (copper, nickel, and manganese).
- The structure of manganin also plays a crucial role in maintaining its resistivity stability. The presence of manganese helps in preventing grain growth, which can impact the resistivity.
- Additionally, the crystal lattice structure of manganin contributes to its temperature-independent resistivity by minimizing the impact of thermal vibrations on electron movement.
Applications of Manganin
- Manganin is commonly used in precision resistors, strain gauges, and other applications where stable resistance values are essential.
- Its low temperature coefficient of resistance and high resistivity make it ideal for precision measurements and temperature compensation circuits.
In conclusion, the resistivity of alloy manganin is nearly independent of temperature due to its unique composition, crystal structure, and the balanced effects of its constituent metals. This property makes manganin a valuable material for applications requiring stable resistance values across varying temperatures.
The resistivity of alloy manganin is nearly independent of temperature. Let's understand why this is the case:
Composition of Manganin
- Manganin is a copper-nickel-manganese alloy known for its high resistivity.
- The composition typically consists of around 84% copper, 12% manganese, and 4% nickel.
Effect of Temperature on Resistivity
- In most materials, the resistivity tends to increase with an increase in temperature. This phenomenon is known as temperature coefficient of resistance.
- However, manganin is unique in this aspect. Due to its specific composition and crystal structure, the resistivity of manganin remains nearly constant over a wide range of temperatures.
- This property makes manganin suitable for applications where stable resistance values are required despite changes in temperature.
Reasons for Temperature Independence
- The constant resistivity of manganin can be attributed to the balanced effects of the temperature coefficients of resistivity of its constituent metals (copper, nickel, and manganese).
- The structure of manganin also plays a crucial role in maintaining its resistivity stability. The presence of manganese helps in preventing grain growth, which can impact the resistivity.
- Additionally, the crystal lattice structure of manganin contributes to its temperature-independent resistivity by minimizing the impact of thermal vibrations on electron movement.
Applications of Manganin
- Manganin is commonly used in precision resistors, strain gauges, and other applications where stable resistance values are essential.
- Its low temperature coefficient of resistance and high resistivity make it ideal for precision measurements and temperature compensation circuits.
In conclusion, the resistivity of alloy manganin is nearly independent of temperature due to its unique composition, crystal structure, and the balanced effects of its constituent metals. This property makes manganin a valuable material for applications requiring stable resistance values across varying temperatures.
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The resistivity of alloy manganin isa)Nearly independent of temperatureb)Increases rapidly with increase in temperaturec)Decreases with increase in temperatured)Increases rapidly with decrease in temperatureCorrect answer is option 'A'. Can you explain this answer?
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