Find the heat current flowing through a hollow thick sphere of inner radius ‘R’ and other radius ‘2R’. Thermal conductivity = K. Temperature inside is T1 and outside is T2 (T1 > T2).
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a
2πKR(T1 - T2)
b
4πKR(T1 - T2)
c
8πKR(T1 - T2)
d
10πKR(T1 - T2)
answer is C.
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Detailed Solution
Net thermal resistance. RH=1K(2R−R)4π(R)(2R)⇒RH=18πKR;Qt=ΔTRH=T1−T28πKR