Two rods of equal length and diameter have thermal conductivities 3 and 4 units respectively. If they are joined in series, the thermal conductivity of the combination would be:

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3.43

3.5

3.4

3.34

answer is A.

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Detailed Solution

In series Keq=∑li∑liKi=l+ll3+l4=247=3.43.

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