The two ends of a rod of length L and a uniform cross-sectional area A are kept at two temperatures T 1 and T 2 (T 1>T 2) . The rate of heat transfer, dQ dt , through the rod in a steady state is given by :

1. A. dQ dt = kA(T 1-T 2) L
2. B. dQ dt = kL(T 1-T 2) A
3. C. dQ dt = k(T 1-T 2) LA
4. D. dQ dt =kLA(T 1-T 2)

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