A strip of copper and another of germanium are cooled from room temperature to 30K. The resistance of: a)Copper strip increases and that of germanium decreases b)Copper strip decreases and that of germanium increases c)Each of them increases d)Each of them decreases and why?

Asked by Shikha Vanjani | 20th Jul, 2013, 01:37: PM

Expert Answer:

Answer is (b). Germanium is a semiconductor.semiconductor conducts at high temperature above room temp, so with dec in temp they becomes insulator hence resistance increases. Whereas copper is a conductor and in conductors with dec in temperature resistance decreases.

Answered by  | 20th Jul, 2013, 05:38: PM

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