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Two rods of equal length and diameter bu...

Two rods of equal length and diameter but of thermal conductivities `1.5` and 3 S.I. units respectivity are joined in series. the thermal conductivity of combination is :

A

`2.5`

B

2

C

`2.25`

D

`4.5`

Text Solution

Verified by Experts

The correct Answer is:
B
In series `k=(2k_(1)k_(2))/(k_(1)+k_(2))=(2xx1.5xx3)/(3+15)=2`.
Thus correct choice is (b).
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