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

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
D

Kl2K l ^ { 2 }

Answer
Explanation

Solution

K=FlK = \frac { F } { l }and W=12Fl=12Kl×l=12Kl2W = \frac { 1 } { 2 } F l = \frac { 1 } { 2 } K l \times l = \frac { 1 } { 2 } K l ^ { 2 }