Why are springs made of steel and not of copper?

Springs are generally made of steel but not of copper and alluminium - explain the reason .

Two wire having same length and same radius and given same load. One made of steel and other copper. If Young's modules of elasticity is twice that of other then calculate the potential energy stored in copper and steel.

A steel wire of length 4.7 m and cross-sectional area 3.0 xx 10^- 5 m^2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 xx 10^-5 m^2 under a given load. What is the ratio of the Young’s modulus of steel to that of copper?

Two wires of same radius and legth are subjected to the same load . One wire is of steel an the other is of copper . If the young modulus of steel is twice that of copper find the ratio of elastic energy stored per unit volume in steel to that of copper .

Assume the thermal conductivity of copper is 4 times that of brass.Two rods of copper and brass having the same length and cross section are joined end to end.The free and end of copper is at 0°C and the free end of brass is at 100°C.Calculate the temperature of the junctionof thw two rods at equilibirum.

Give reasons why copper is used to make hot water tank and not steel (an alloy of iron).

If a bimetallic strip made of iron and copper is heated ,then

A wound spring has

Why are pole pices of galvanometer made concave?