A strip of copper and another of germanium are cooled from room temperature to . The resistance of:
- Aeach of these decreases
- Bcopper strip increases and that of germanium decreases
- Ccopper strip decreases and that of germanium increases
- Deach of these increases
Solution & Step-by-step Explanation
Copper is a conductor, so its resistance decreases as temperature decreases (positive temperature coefficient).Germanium is a semiconductor, so its resistance increases as temperature decreases (negative temperature coefficient) because the concentration of charge carriers reduces.