Correct Answer - Option 1 : Decreases
The correct answer is Decreases.
On heating, bonds between the electrons of semiconductors break because of the energy gained due to heating.
- Electrons become free & help in the conduction of electric current if there is a potential difference is applied across the semiconductor.
- Hence the resistance decreases on heating.
Effect of temperature on resistance of different material:
Conductor: When the temperature of conducting material increases, the resistance of that particular material increases.
Insulator: When the temperature of the material increases, the resistance of that particular material decreases.
Carbon is a non-metal, semiconductor and its resistance decreases with an increase in temperature.
Constantan is a Nickel-Copper based alloy wire that has a high resistivity and is mainly used for thermocouples and electrical resistance heating. It contains 60% of nickel and 40%, copper. It has a constant resistivity over a wide range of temperature.
Silver and copper are metal conductor which has a positive temperature coefficient which causes an increase in resistance due to an increase in temperature.
