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The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T1 and T2T1> T2.The rate f heat transfer, dQdt, through the rod in a steady state is given by 

(a) dQdt=KLT1-T2A                       (b) dQdt=KLT1-T2LA

(c) dQdt=KLAT1-T2                      (d) dQdt=KLT1-T2L

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