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. lf the length of the first wire is increased by on applying a force F, how much force is needed to stretch the second wire by the same amount ?
We know
For 1st wire;
For IInd wire;
As volume of the wire is same
Hence,
or
From (i) and (ii); -----------(iv)
From (iii) and (iv);