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Q.

The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2 (T1 > T2 ). The rate of heat transfer, dQdtthrough the rod in a steady state is given by:

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a

dQdt=kA(T1-T2)L

b

dQdt=kL(T1-T2)A

c

dQdt=k(T1-T2)LA

d

dQdt=kLAT1-T2

answer is A.

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Qt=k A(T1-T2)L
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