If force constant of a wire is K, work done in increasing length of wire by l is

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8.Mechanical Properties of Solids

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If the force constant of a wire is $K,$ the work done in increasing the length of the wire by $l$ is

A

$Kl/2$

B

$Kl$

C

$K{l^2}/2$

D

$K{l^2}$

Solution

(c) $K = \frac{F}{l}$and $W = \frac{1}{2}Fl = \frac{1}{2}Kl \times l = \frac{1}{2}K{l^2}$

Standard 11

Physics

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