APFIVE Rate of Heat Conduction in a Rod
A cylindrical rod of constant length conducts heat at a rate P. If the diameter of the rod and the temperature difference across its ends are both doubled, what is the new rate of heat conduction, P’, in terms of P?
A
P’ = 8P
B
P’ = 16P
C
P’ = 2P
D
P’ = 4P
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