A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature `theta` along the length x of the bar from its hot end is best described by which of the following figures?

Options

A.
B.
C.
D.

Answer

B

Explanation

(2) `(theta_(1) - theta_(2))/(L) = (theta_(1) - theta)/(x)`
`theta = - ((theta_(1) - theta_(2))/(L)) x + theta_(1)`
`theta v//s x` is a straight line with negative slopw and positive intercept.