149
Question
In which of the following substances the resistance decreases with the increase in temperature?
In which of the following substances the resistance decreases with the increase in temperature?
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Solution
The correct option is A carbon
Answer is A.
Semiconductors have an energy gap between the valence and conductive bands. Heating carbon introduces more electrons in the conductive band decreasing resistance. Cooling forces the electrons from the conductive band down to the valence band, increasing resistance.
In insulators and partial conductors such as carbon, increase in temperature results in decrease in resistance. Thus semiconductors or insulators are said to be in negative temperature coefficient of resistance.
Answer is A.
Semiconductors have an energy gap between the valence and conductive bands. Heating carbon introduces more electrons in the conductive band decreasing resistance. Cooling forces the electrons from the conductive band down to the valence band, increasing resistance.
In insulators and partial conductors such as carbon, increase in temperature results in decrease in resistance. Thus semiconductors or insulators are said to be in negative temperature coefficient of resistance.
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