Heat transfer rate through the wall of a circular tube with convection acting on the outer surface is given per unit of its length by where i refers to the inner tube surface and o the outer tube surface. Increasing ro will reduce the heat transfer as long as
(a) ro < k/h
(b) ro = k/h
(c) ro >k/h
(d) ro > 2k/h
(e) increasing ro will always reduce the heat transfer
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