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Two pieces, one of the germanium and the other of the aluminium are cooled from $T_1K$ to $T_2K$. The resistance of: |
aluminium increases and that of germanium decreases each of them decreases aluminium decreases and that of germanium increases each of them increases |
aluminium decreases and that of germanium increases |
The temperature coefficient of resistance of aluminium is positive and of germanium is negative. Hence the resistance of aluminium decreases and that of germanium increases with decreases in temperature. |
