Three metal rods made of copper, brass and steel each of area of cross-section 4 cm^(2) are joined as shown in the figure. Their lengths are respectively 46 cm, 13 cm and 12 cm. Their coefficients of thermal conductivity are respectively 0.92, 0.26 and 0.12, all in CGS units. The rods are thermally insulated from the surroundings except at the ends. Rate of flow of heat through the copper rod. in cal S^(-1) is

Three metal rods made of copper, brass and steel each of area of cross

1.	Three metal rods made of copper, brass and steel each of area of cross-section 4 cm^(2) are joined as shown in the figure. Their lengths are respectively 46 cm, 13 cm and 12 cm. Their coefficients of thermal conductivity are respectively 0.92, 0.26 and 0.12, all in CGS units. The rods are thermally insulated from the surroundings except at the ends. Rate of flow of heat through the copper rod. in cal S^(-1) is
Answer» 2.4 6 4.8 8.2 Answer :A