Two wires are made of the same material and have the same volume. However, wire 1 has cross-sectional area A…..

Q: Two wires are made of the same material and have the same volume. However, wire 1 has cross-sectional area A and wire 2 has cross-sectional area 3A. If the length of wire 1 increases by Δx on applying force F, then how much force is needed to stretch wire 2 by the same amount?

(a) F

(b) 4F

(c) 6F

(d) 9F

Ans: (d)

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