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Question

The temperatures at the two ends A and B of a rod of length 25 cm and circular cross section are 100C and 0C respectively. In the steady state the temperature at a point 10 cm from the end B is:
(Ignore loss of heat from curved surface of the rod)

A
80C
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B
90C
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C
40C
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D
60C
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Solution

The correct option is B 40C
Since the temperature gradient (dTdx) is maintained same at all points in the rod,
the difference in temperature across a point 10cm from one end =1025×100C=40C

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