An iron rod of length 50cm is joined end to end to an aluminium rod of length 100cm. All measurements refer to 20^(@)C. The coefficients of linear expansion of iron and aluminium are 12xx10^(-6)//""^(@)Cand24xx10^(-6)//""^(@)C respectively. The average coefficient of composite rod is

An iron rod of length 50cm is joined end to end to an aluminium rod of

1.	An iron rod of length 50cm is joined end to end to an aluminium rod of length 100cm. All measurements refer to 20^(@)C. The coefficients of linear expansion of iron and aluminium are 12xx10^(-6)//""^(@)Cand24xx10^(-6)//""^(@)C respectively. The average coefficient of composite rod is
Answer» `20 xx 10^(-6)//""^(@) C` `36 xx 10^(-6)//""^(@) C` `12 xx 10^(-6)//""^(@) C` `48 xx 10^(-6)//""^(@) C` ANSWER :A