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The two ends of a rod of length x and a ...

The two ends of a rod of length x and a uniform cross-sectional area A are kept at two temperatures `theta_1` and `theta_2`, `(theta_1, > theta_2)`. The rate of heat transfer `(dQ)/dt` through the rod in a steady state is given by

A

`(dQ)/dt=K(theta_1-theta_2)/xA`

B

`(dQ)/dt=Kx A(theta_1-theta_2)`

C

`(dQ)/dt=KA(theta_1-theta_2)/x`

D

`(dQ)/dt=Kx(theta_1-theta_2)/A`

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