Which one of the following has negative temperature coefficient?
Correct answer: B. Thermistor
- A. Copper
- B. Thermistor
- C. Soft iron
- D. Platinum
Explanation
NTC, negative thermistors are resistors with a negative temperature coefficient which means the resistance decreases with increasing temperature. Hence the answer will be B.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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