Three identical conducting rods are connected as shown in figure. Given that `theta_a = 40^@C`, `theta_c = 30^@C` and `theta_d = 20^@C`. Choose the correct options.

Four identical heat conductors are connected as shown in the figure. The temperature theta of the junction is [rods are insulated from the sides ]

Four identical heat conductors are connected as shown in the figure. The temperature theta of the junction is [rods are insulated from the sides ]

Three identical resistances A , B and C are connected as shown in the given figure. The heat produced will be maximum

Five identical rods are joined as shown in figure. Point A and C are maintained at temperature 120° C and 20° C respectively. The temperature of junction B will be

Three conducting rods of same material and cross-section are shown in figure. Temperatures of A,D and C are maintained at 20^(@)C, 90^(@)C and 0^(@)C . The ratio of lengths BD and BC if there is no heat flow in AB is

Three conducting rods of same material and cross-section are shown in figure. Temperatures of A,D and C are maintained at 20^(@)C, 90^(@)C and 0^(@)C . The ratio of lengths BD and BC if there is no heat flow in AB is

Seven identical rods of material of thermal conductivity k are connected as shown in Fig. All the rods are of identical length l and cross sectional area A If the one end A is kept at 100^@C and the other end is kept at 0^@C what would be the temperatures of the junctions C, D and E(theta_C , theta)D and theta_E ) in the steady state?