An Aluminium wire and a steel wire of the same length and cross section are joined end to end. The composite wire is hung from a rigid support and a load issuspended from the free end. The young's modulus of steel 20/7 times that of the Aluminium. The ratio of increase of length of steel to Aluminium is

An Aluminium wire and a steel wire of the same length and cross sectio

1.	An Aluminium wire and a steel wire of the same length and cross section are joined end to end. The composite wire is hung from a rigid support and a load issuspended from the free end. The young's modulus of steel 20/7 times that of the Aluminium. The ratio of increase of length of steel to Aluminium is
Answer» `20//7` `400//49` `7//20` `49//400` ANSWER :B