A strip of copper and another of germanium are cooled from room temperature to $80\, K$. The resistance of
AIEEE 2003, Easy
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$(A)$ directly proportional to the length of the potentiometer wire
$(B)$ directly proportional to the potential gradient of the wire
$(C)$ inversely proportional to the potential gradient of the wire
$(D)$ inversely proportional to the length of the potentiometer wire
Choose the correct option for the above statements:
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