Two wires have the same material and have the same volume. However wire 1 had cross sectional area A and wire 2 has cross sectional area 3A. If the length of wire 1 increases by ∆x on applying force F, how much force is needed to stretch wire 2 by the same amount?
This question was posed to me in a job interview.
Query is from Stress and Strain topic in chapter Thermal Properties of Matter of Engineering Physics I