Question

A steel wire of diameter 1 mm, and length 2 m is stretched by applying a force of 2.2 kg wt. the strain is
A. `0.7xx10^(-4)`
B. `1.4xx10^(-4)`
C. `1.9xx10^(-5)`
D. `2.8xx10^(-4)`

Answer 1

Correct Answer - B
`(l)/(L)=(F)/(Ay)=(2.2xx10)/(3.14xx0.25xx10^(-6)xx2xx10^(11))`
`=(4.4)/(3.14)xx10^(-4)=1.4xx10^(-4)`