An iron rod of length 50 cm is jointed 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 12xx 10^(-6) //^(@) C and 24 xx 10^(-6)//^(@) C. Respectively. The average coefficient of composite system is

An iron rod of length 50 cm is jointed at an end to an aluminium rod o

1.	An iron rod of length 50 cm is jointed 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 12xx 10^(-6) //^(@) C and 24 xx 10^(-6)//^(@) C. Respectively. The average coefficient of composite system is
Answer» `36 XX 10^(-6)//^(@) C` `12 xx 10^(-6)//^(@) C` `20 xx 10^(-6)//^(@) C` `48 xx 10^(-6)//^(@) C` Answer :C