Question

The temperature of a wire of length 1 metre and area of cross-section `1 cm^(2)` is increased from `0^(@)C` to `100^(@)C`. If the rod is not allowed to increased in length, the force required will be `(alpha=10^(-5)//.^(@)C and Y =10^(11) N//m^(2))`
A. `10^(3) N`
B. `10^(4)` N
C. `10^(5) N`
D. `10^(9) N`

Answer 1

Correct Answer - B
(b) F=Force developed `F=Yaalpha(Deltatheta)`
`=10^(11)xx10^(-4)xx10^(-5)xx100=10^(4)N`