A 5 metre long wire is fixed to the ceiling. A weight of `10kg` is hung at the lower end and is `1metre` above the floor. The wire was elongated by `1mm`. The energy stored in the wire duw to streching is

Options

A. 0.01J
B. 0.05 J
C. 0.02 J
D. 0.04J

Answer

B

Explanation

(b) The energy stored in the wire.
`U=(1)/(2) xx F xx l=(1)/(2)mgl=(1)/(2)xx10xx10xx1xx10^(-3)=0.05 J`