Test Academy | A iron rod of length 50 cm is joined at an end to an aluminium rod of length 100 cm. All measurements refer to 20°C. The coefficients of linear expansion of iron and aluminium are 12 x 10⁻⁶ /°C and 24 x 10⁻⁶/°C respectively. The average coefficient of composite system is 36 x 10⁻⁶/°C, 12 x 10⁻⁶/°C, 20 x 10⁻⁶/°C, 48 x 10⁻⁶/°C

Question

A iron rod of length 50 cm is joined at an end to an aluminium rod of length 100 cm. All measurements refer to 20°C. The coefficients of linear expansion of iron and aluminium are 12 x 10⁻⁶ /°C and 24 x 10⁻⁶/°C respectively. The average coefficient of composite system is

Options :

36 x 10⁻⁶/°C
12 x 10⁻⁶/°C
20 x 10⁻⁶/°C
48 x 10⁻⁶/°C

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