(2) Hint: The tension or compression in the wires will be the same.
Step 1: Find the stress in both the wires.
Consider the diagram where a deforming force F is applied to the combination.
For steel wire,
For copper wire,
where F is tension in each wire and A is the cross-section area of each wire.
As F and A are the same for both the wires, hence, stress will be the same for both the wires.
Step 2: Find the strain in the two wires.
,
As
Hence, the two wires will have different strain.