Hg 12. Two Aluminium rods and a steel rod of equal cross-sectional area and equal length are joined rigidly side by side as shown in figure. Initially the rods are at 0°С. Find the length of the rod at the temperature e if young's modulus of elasticity of the aluminium and steel are Y and Y respectively and coefficient of linear expansion of aluminium and steel are a and a respectively. [HCV Modified STK Sir] Aluminium Steel Aluminium

Two Aluminium rods and a steel rod of equal cross-sectional area and equal length l_(0) are joined rigidly side by side as shown in figure. Initially the rods are at 0^(@)C . Find the length of the rod at the temperature theta if young's modulus of elasticity of the aluminium and steel are Y_(a) and Y_(s) respectively and coefficient of linear expansion of aluminum and steel are alpha_(a) and alpha_(s) respectively. |{:("Aluminium"),("Steel"),("Aluminium"):}|

Two steel rods and an aluminium rod of equal length l_0 and equal cross- section are joined rigidly at their ends as shown in the figure below. All the rods are in a state of zero tension at 0^@ C . Find the length of the system when the temperature is raised to theta . Coefficient of linear expansion of aluminium and steel are alpha_(a) and alpha_(s) respectively. Young's modulus of aluminium is Y_(a) and of steel is Y_(s) .

Two steel rods and an aluminum rod of equal length l_0 and equal cross section are joined rigidly at their ends as shown in the figure below. All the rods are in a state of zero tension at 0^@C . Find the length of the system when the temperature is raised to theta . Coefficient of linear expansion of aluminum and steel are alpha_a and alpha_s respectively. Young's modulus of aluminum is Y_a and of steel is Y_s .

Two steel rods and an aluminum rod of equal length l_0 and equal cross section are joined rigidly at their ends as shown in the figure below. All the rods are in a state of zero tension at 0^@C . Find the length of the system when the temperature is raised to theta . Coefficient of linear expansion of aluminum and steel are alpha_a and alpha_s respectively. Young's modulus of aluminum is Y_a and of steel is Y_s .

Two rods of equal length and cross- sectional area have their Young's moduli Y_1 and Y_2 respectively. IF the rods are joined end to end, then the equivalent Young's modulus of the combined rod system is