The two ends of a rod of length $x$ and uniform cross-sectional area $A$ are kept at temperatures $T_1$ and $T_2$ respectively $(T_1 > T_2)$. If the rate of heat transfer through the rod in steady state is $Q/t$,then the coefficient of thermal conductivity $K$ is:
- A$\frac{AQ}{tx(T_1-T_2)}$
- B$\frac{xQ}{tA(T_1-T_2)}$
- C$\frac{xAQ}{t(T_1-T_2)}$
- D$\frac{Q}{txA(T_1-T_2)}$
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