The coefficient of thermal conductivity of copper is nine times that of steel. One end of copper is maintained at 100°C and the other end of steel is maintained at 0°C. If the corresponding lengths of the copper and iron are 18cm and 6cm respectively, What will be the temperature at the junction of copper and steel ?

A copper strip AB and an iron strip AC are joined at A . The junction A is maintained at 0^@ C and the free ends B and C are maintained at 100^@ C . There is a potential difference between

The ends of a metre stick are maintain at 100^(@)C and 0^(@)C . One end of a rod is maintained 25^(@)C . Where should its other end be touched on the metre stick so that there is no heat current in the rod in steady state?

The temperature of hot and cold end of a 20cm long rod in thermal steady state are at 100° C and 20°C respectively. Temperature at the centre of the rod is

The coefficients of thermal conductivity of copper, mercury and glass are respectively K_c , K_m and K_g such that K_c > K_m > K_g . If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradients are X_c , X_m and X_g , then

While measuring the length of a sharpened pencil, reading of the scale at one end is 2.0 cm and at the other end is 12.1 cm. What is the length of the pencil?

Two parallel plates A and B are joined together to form a compound plate . The thicknesses of the plate are 4.0cm and 2.5cm respectively and the area of cross section is 100cm^(2) for each plate. The thermal conductivities are K_(A)=200Wm^(-1) C^(-1) for plate A and K_(B)=400Wm^(-1) C^(-1) for the plate B. The outer surface of the plate A is maintained at 100^(@)C and the outer surface of the plate B is maintained at 0^(@)C . Find (a) the rate of heat flow through any cross section, (b) the temperature at the interface and (c) the equivalent thermal conductivity of the compound plate.

One end of a metal rod of length 1.0 m and area of cross section 100cm^2 is maintained at 100° C. If the other end of the rod is maintained at 0°C, the quantity of heat transmitted through the rod per minute is (Coefficient of thermal conductivity of material of rod =100 W/m-K)

A glass tube sealed at both ends is 100cm long, It lies horizontally with the middle 10cm containing mercury. The two ends of the tube contain air at 27^(@)C and at a pressure 76cm of mercury. The air column on one side is maintained at 0^(@)C and the other side is maintained at 127^(@)C . Calculate the length of the air column on the cooler side. neglect the changes in the volume of mercury and of the glass.

One face of a copper cube of edge 10 cm is maintained at 100^(@)C and the opposite face is maintained at 0^(@)C . All other surfaces are covered with an insulating material. Find the amount of heat flowing per second through the cube. Thermal conductivity of copper is 385Wm^(-1) C^(-1) .

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 second rods are maintained at θ_1 and θ_2 respectively. The temperature of the common junction is