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Question

If the temperature of the surrounding is increased keeping all other parameters constant, then the rate of heat transfer from a comparatively hotter body due to convection will

A
not change
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B
increase
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C
decrease
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D
first increases then decreases
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Solution

The correct option is C decrease
We know that, rate of heat transfer in convection, q=hcAΔT ..............(1)
where hc is convection coefficient, A is surface area of body and ΔT= temperature difference between body and surrounding.
ΔT=TTo
As surrounding temperature To increases, ΔT will decrease.
Thus, rate of heat transfer q will decrease. [ from (1) ]

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