a wire whose cross-sectional area is 4mm^2

Question

is stretched by 0.1 mm by a certain load.if a similar wire double the area of cross-section is under the same load,then then elongation would be
ans:
1)0.05mm

Answer 1

Doubling the cross section area decreases the stress by a factor of two. The strain is also reduced by the same factor, so that the elongation is 0.05 mm (instead of 0.1 mm)

Your answer is correct.

Answer 2

Correct