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Current Electricity — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsCurrent Electricity1 Mark
MCQ
Constantan wire is used in making standard resistances because its
  • A
    Specific resistance is low
  • B
    Density is high
  • ✓
    Temperature coefficient of resistance is negligible
  • D
    Melting point is high
✓

Answer

Correct option: C.
Temperature coefficient of resistance is negligible
(c) Due to the negligible temperature co-efficient of resistance of constantan wire, there is no change in it's resistance value with change in temperature.

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