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 on applying a force F, how much force is needed to stretch the second wire by the same amount ?
4 F
6 F
9 F
F
As we have learned
Young Modulus -
Ratio of normal stress to longitudnal strain
it denoted by Y
- wherein
F - applied force
A - Area
- Change in lenght
l - original length
in second case ,
volume = constant
or
Option 1)
4 F
This is incorrect
Option 2)
6 F
This is incorrect
Option 3)
9 F
This is correct
Option 4)
F
This is incorrect