If a wire is extended to a new length l, the work done is .........

1.	If a wire is extended to a new length l, the work done is .........
Answer» `(YA (l -l'))/(l)` `(YA (l -l' ) ^(2))/(l)` `(1)/(2) (YA)/(l) (l-l')^(2)` `2 (YA)/(l) (l-l')^(2)` Solution :`Y= ((F)/(A))/( (DELTAL )/(l ))` `therefore F = (YA)/( l ) . Delta l =k. Delta l` `therefore` Force `PROP` extension If the extension is x, work done in extending by dx `dW = F. dx = KX dx` `therefore W = 1/2 kx ^(2) ` `If x is l .-l =x` `W = 1/2 k (l.-l)^(2)` MEANS work DONC `= 1/2 (YA)/(l) (l -1l.)^(2)`

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