The metal rods of same length and same area of cross-section are connected in series. If their condcutivites are `120 Wm^(-1) and 240 Wm^(-1) K^(-1)` the effective conductivity of the combination is

Two metal rods of same length and same cross sectional area are connected in Series. If their conductivities are 120 Wm^(-1)K^(-1) and 240 Wm^(-1)K^(-1) then effective conductivity of the combination is

Three metal rods of same length and same cross - sectional area are connected in parallel. If their conductivities area 70, 110, 180 Wm^(-1) K^(-1) respectively, the effective conductivity (in Wm^(-1) K^(-1)) of the combination is

Three metal rods of same length and same cross sectional area are connected in Parallel. If their conductivities are 70 Wm^(-1) K^(-1) , 110 Wm^(-1) K^(-1) and 180 wm^(-1) K^(-1) respectively then effective conductivity of the combination is

Three metal rods of same lengths and same area of cross-section having conductivities 1, 2, 3 units are connected in series. Then their their effective conductivity will be

Three metal rods of same lengths and same area of eross-section having conductivities 1,2,3 units are connected in series. Then theireffective conductivity will be

Two conductors the of same lengths and areas of cross-section are connected in series. Give the expression for common (junction) temperature.

Three metal rods of same lenghs and same area of cross sections having conductivities 1,2,3, units are connected in series Then their effective conductivity will be .

Two metallic rods are connected in series. Both are of same material of same length and same area of cross-section. If the conductivity of each rod be k, then what will be the conductivity of the combination ?

Two identical metal wires of thermal conductivities K_(1) and K_(2) respectively are connected in series. The effective thermal conductivity of the combination is :