When metal  wire is connected in the left gap and germanium wire is connected in the right gap of metre bridge,  balancing point is found at 50 cm. Metal wire is heated and germanium is cooled so that variations of resistances in them are equal. Then the balancing point
 

if left gap resistance is increased and right gap resistance is increasing then balancing point shifts towards right .metallic wire in the left gap so increase in temperature resistance increases whereas in the right gap there is germanium which is a semiconductor resistance increases on cooling.