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The length of a rod is 20 cm and area of...

The length of a rod is `20 cm` and area of cross-section `2 cm^(2)`. The Young's modulus of the material of wire is `1.4 xx 10^(11) N//m^(2)`. If the rod is compressed by 5 kg-wt along its length, then increase in the energy of the rod in joules will be

A

0.1 J

B

0.2 J

C

0.3 J

D

0.8 J

Text Solution

Verified by Experts

The correct Answer is:
D
`W=(1)/(2) xx Fl=(400 xx 4 xx10^(-3))/(2) =0.8J`.
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