Question

Two wires are made of the same material and have
the same volume. The first wire has cross-sectional
area A and the second wire has cross-sectional
area 3A. If the length of the first wire is increased
by Al on applying a force F, how much force is
needed to stretch the socond wire by the same
amount?
(1) 9F
(3) F
(4) 4F
(2) 6F​

Answer 1

Hope the upper attachment helps you!!

Answer 2

Explanation:

Solution :

(same volume as wire 1). For wire 1,

...(i) For wire 2, <br>

...(ii) From (i) and (ii),