JEE Main 2003 Physics question

A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

(1)each of these decreases
(2)copper strip increases and that of germanium decreases
(3)copper strip decreases and that of germanium increasesCorrect
(4)each of these increases

Answer: (3)

Solution

Copper (metal) has a positive temperature coefficient of resistance — cooling reduces lattice vibrations, so its resistance decreases. Germanium (semiconductor) has a negative

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Question ID VK-038106