A cylindrical rod having temperature T1 and T2 at its end. The rate of flow of heat Q1 cal/sec......

A cylindrical rod having temperature T1 and T2 at its end. The rate of flow of heat Q1 cal/sec . If all the linear dimension are doubled keeping temperature constant , then rate of flow of heat Q2 will be --
a) 4Q1
b) 2Q1
c) Q1/4
d) Q1/2
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Видео A cylindrical rod having temperature T1 and T2 at its end. The rate of flow of heat Q1 cal/sec...... канала RASA CLASSES ( ALAMBAGH LUCKNOW NEET JEE-MAINS )