Two rod of same length and same diameter are drawn from equal masses and same quantity of heat I is supplied to the rods. If the are rods joined together to 100oC and 40oC at the ends, find ratio of their conductivities.
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Solution
The two rods have same length L and same cross-sectional A(=πD24) but different conductivities K1 & K2, joined in series:- [Ref. above image]
The current (I=dQdt,Q:Heat supplied) is constant in series convection.