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.
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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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