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Question

Two rods of equal length and area of cross-section are connected in parallel between temperatures 200C and 800C . If ratio of their thermal conductivities is 3:4,then the ratio of the effective thermal conductivity to that of the first rod thermal conductivity is


A

7:4

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B

7:6

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C

4:7

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D

7:8

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Solution

The correct option is B

7:6


Kp=k1+k22 ;Kp:K1= 7:6


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