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Three rods of same dimensions are arranged as shown in Fig. They have thermal conductivities `K_1`,`K_2` and `K_3`. The points P and Q are maintained at different temeperature for the heat to flow at the same rate along PRQ and PQ. Whi of the following options correct?

A

`K_(3)=1/2(K_(1)+K_(2))`

B

`K_(3)=K_(1)+K_(2)`

C

`K_(3)=(K_(1)K_(2))/(K_(1)+K_(2))`

D

`K_(3)=-2(K_(1)+K_(2))`

Text Solution

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