Physics Current Electricity SZABMU 2024
PMDC Verified Question 6 of 112
Which one of the following materials has negative temperature coefficient of resistance?
A
Copper
B
Germanium
C
Sulphur
D
Zinc
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Germanium
Concept:

A negative temperature coefficient means the material's resistance drops as temperature goes up.

Solution:

  • Metals (like Copper and Zinc) have positive coefficients because heat increases atomic vibrations and scattering.


  • Semiconductors, like Germanium (and Silicon), have negative coefficients. Heating them frees massive amounts of valence electrons across the band gap, vastly improving conductivity and plummeting resistance.


Why other options are incorrect:

  • Opt A & D: Metals. Resistance increases with heat.


  • Opt C: Sulphur is a strong insulator.

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