The rate of heat transfer through a pipe wall is given by, q = 2? k (Ti T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?

A. q = 2? k (Ti T0)/(r0/ri)

B. q = 2? ri k (Ti T0)/(r0/ri)

C. q = [2? k (Ti + T0)/2]/ln (ri/r0)

D. q = 2? k (Ti T0)/[(r0 + ri)/2]
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