Six identical conducting rods are joined as shown in figure. Points A and D are maintained at temperatures respectively. The temperature of junction B will be

If each rod has a thermal resistance R , resistance between B and C  is also R  (R and R are in series and 2R and 2R are in parallel)so temperature difference will be equally distributed i.e. across each rod it will be  200-203 =60   so  200-Tb=60     Tb=1400C