Two rods of same length and cross section are joined along the length. Thermal conductivities of first and second rod are `K_(1)` and `K_(2)`. The temperature of the free ends of the first and seconds rods are maintained at `theta_(1)` and `theta_(2)` respectively. The temperature of the common junction is

Options

A. `(theta_(1_+theta_(2))/(2))`
B. `(k_(1)theta_(1)+k_(2)theta_(2))/(k_(1)+k_(2))`
C. `(k_(1)theta_(2)+k_(2)theta_(1))/(k_(1)+k_(2))`
D. `(|k_(1)theta_(1)+k_(2)theta_(2)|)/(|k_(1)_k_(2)|)`