By increasing the temperature, the specific resistance of a conductor and a semiconductor
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → increases and decreases, respectively
Specific resistance (also called resistivity) is the inherent property of a material that resists current flow.
For conductors: As temperature increases, lattice vibrations increase, which scatter electrons more and thus increase resistivity.
For semiconductors: As temperature increases, more charge carriers (electrons and holes) are generated, which decreases resistivity.
Therefore:
Specific resistance of a conductor increases with temperature.
Specific resistance of a semiconductor decreases with temperature.