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Constantan wire is used in making standa...

Constantan wire is used in making standard resistance because its

A

melting point is high

B

density is high

C

specific resistance is low

D

temperature coefficient of resistance is negligible

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • Constantan wire is used in making standard resistances, because its :–

    A
    specific resistance is low
    B
    density is high
    C
    temperature coeff. of resistance is negligible
    D
    melting point is high

  • The alloys constantan and manganin are used to make standard resistance due to they have

    A
    Low resistivity
    B
    High resistivity
    C
    Low temperature coefficient of resistance
    D
    Both (b) and (c)

  • Constanton or manganin is widely used in wire wound standard resistors because of their

    A
    temperature independent resistivity.
    B
    very weakly temperature dependent resistivity.
    C
    strong dependence of resistivity on temperature.
    D
    mechanical strength.

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    Why are alloys, manganin and constantan used to make standard resistance coils ?

    (i) Define the term drift velocity. (ii) On the basis of electron drift, derive an expression for resistivity of a conductor in terms of number density of free electron and relaxation time. On what factors does resistivity of a conductor depend ? (iii) Why alloys like constantan and manganin are used for making standard resistors ?

    Draw a graph showing variation of resistivity with temperature for nichrome. Which property of nichrome is used to make standard resistance coils ?

    Nichrome or Manganin is widely used in wire bound standard resistors because of their

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