Heat and Thermal ExpansionHard
Question
The area of cross-section of rod is given by A = A0 where A0 & constant and x is the distance from one end. If thermal conductivity of the material is K, what is the thermal resistance of the rod if its length is l0?
Options
A.KA0αl (1 + αl0)
B.
l (1 + αl0)
l (1 + αl0)C.
N l (1 + αl0)
N l (1 + αl0)D.
N l (1 + αl0)
N l (1 + αl0)Solution
dRH = 
RH =
dRH =
=
ln(1 + αl0)
OR
Check dimensionally
RH =
dRH ==
ln(1 + αl0)OR
Check dimensionally
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