In which case there is maximum tension in the wire, if same force is applied on each wire

Options

A. L=400 cm, d=0.01 mm
B. L=300 cm, d=0.03 mm
C. L=200 cm, d=0.02 mm
D. L=500 cm, d=0.05 mm

Answer

A

Explanation

`Y=(F)/(A)(L)/(DeltaL)`
`implies DeltaL=(f)/(A)(L)/(Y)=(F)/(pi(d^(2)//4))(L)/(Y)=(4F)/(piY)""((L)/(d^(2)))`
Here `L//d^(2)` is maximum for wire in option (1)