Question
Physics Question on mechanical properties of solids
A wire fixed at the upper end stretches by length by applying a force F. The work done in stretching is
A
2ℓF
B
Fℓ
C
2Fℓ
D
2Fℓ
Answer
2Fℓ
Explanation
Solution
Let the area be A and length L of the string then the work done by the force is : W=21×stress×strain×volume=21×AF×L1×A×L=2F1