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GUJCET · Physics · Current Electricity
A piece of copper and another of Germanium are cooled from room temperature to 40 K . The resistance of __________.
- A copper decreases and germanium increases.
- B each of them decreases.
- C each of them increases.
- D copper increases and germanium decreases.
Answer & Solution
Correct Answer
(A) copper decreases and germanium increases.
Step-by-step Solution
Detailed explanation
(A)
The resistance of conductor is directly proportional to the temperature and that of a semiconductor is inversely proportional to the temperature. So when cooled, the resistance of copper decreases and that of germanium increases.
The resistance of conductor is directly proportional to the temperature and that of a semiconductor is inversely proportional to the temperature. So when cooled, the resistance of copper decreases and that of germanium increases.
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