(A) In a steady state,the rate of heat flow $(H)$ through the copper and brass slabs connected in series must be equal.$H = \frac{K_1 A (T_1 - T)}{L}

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(A) In a steady state,the rate of heat flow $(H)$ through the copper and brass slabs connected in series must be equal.$H = \frac{K_1 A (T_1 - T)}{L} = \frac{K_2 A (T - T_2)}{L}$Given that the sides are equal,the area $(A)$ and length $(L)$ of both cubes are the same.Let $K_c$ be the thermal conductivity of copper and $K_b$ be the thermal conductivity of brass.Given $K_c : K_b = 4 : 1$,so $K_c = 4K_b$.Let $T$ be the temperature of the interface.$4K_b (100 - T) = K_b (T - 0)$$4(100 - T) = T$$400 - 4T = T$$5T = 400$$T = 80^{\circ} C$.

Class 11 Physics 2 Thermal Properties of Matter: Heat Transfer Heat Conduction and Thermal Conductivity

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$A$ rectangular slab consists of two cubes of copper and brass of equal sides having thermal conductivities in the ratio $4: 1$. If the free face of brass is at $0^{\circ} C$ and that of copper is at $100^{\circ} C$,then the temperature of their interface is (in $^{\circ} C$)

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2 Thermal Properties of Matter: Heat Transfer

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Heat Conduction and Thermal Conductivity

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$A$ rectangular slab consists of two cubes of copper and brass of equal sides having thermal conductivities in the ratio $4: 1$. If the free face of brass is at $0^{\circ} C$ and that of copper is at $100^{\circ} C$,then the temperature of their interface is (in $^{\circ} C$)

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Two walls of thickness $d_1$ and $d_2$ and thermal conductivities $k_1$ and $k_2$ are in contact. In the steady state,the temperatures of the outer surfaces are $T_1$ and $T_2$. Find the temperature of the common interface.

In the Ingen-Hauz's experiment,the wax melts up to lengths $10 \ cm$ and $25 \ cm$ on two identical rods of different materials. The ratio of thermal conductivities of the two materials is:

For cooking the food,which of the following type of utensil is most suitable?

Two different rods $A$ and $B$ are kept as shown in the figure. The ratio of thermal conductivities of $A$ and $B$ is

Two identical long bars $A$ and $B$ made of different materials are coated with wax and have one end immersed in a hot oil bath. When the steady state is reached, the lengths for which the wax melts are $l_A$ and $l_B$. If $k_A$ and $k_B$ are the thermal conductivities of the materials, then:

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