A semicircular rod is joined at its end to a straight rod of the same material and the same cross -sectional area. The straight rod forms a diameter of the other rod. The junctions are maintained at different temperatures. Find the ratio of the heat transferred through a cross section of the semicircular rod to the heat transferred through a cross section of the straight rod in a given time.
We know Q=kA(θ1−θ2)d
where d1=πr d2=2r