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A piece of copper and another of germanium are cooled from roo
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A piece of copper and another of germanium are cooled from room temperature to , the resistance of
(a) each of them increases
(b) each of them decreases
(c) copper decreases and germanium increases
(d) copper increases and germanium decreases

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Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

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Exam:

JEE Mains 2003

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A piece of copper and another of germanium are cooled from room temperature to , the resistance of
(a) each of them increases
(b) each of them decreases
(c) copper decreases and germanium increases
(d) copper increases and germanium decreases
9 mins ago
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Text SolutionText solutionverified iconVerified

Exp. (c)
We know that resistance of conductor is directly proportional to temperature (i.e., ), while resistance of semiconductor is inversely proportional to temperature i.e., .
Therefore, it is clear that resistance of conductor decreases with decrease in temperature or vice-versa, while in case of semi-conductor, resistance increases with decrease in temperature or vice-versa.
Since, copper is pure conductor and germanium is a semiconductor, hence due to decrease in temperature, resistance of conductor decreases while that of semi-conductor increases.
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Question Text
A piece of copper and another of germanium are cooled from room temperature to , the resistance of
(a) each of them increases
(b) each of them decreases
(c) copper decreases and germanium increases
(d) copper increases and germanium decreases
TopicSemiconductor Electronics: Materials, Devices and Simple Circuits
SubjectPhysics
ClassClass 12
Answer TypeText solution:1
Upvotes90