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Copper of fixed volume V is drawn into a...

Copper of fixed volume V is drawn into a wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is `Deltal`. Which of the following graphs is a straight line?

A

`Delta l Versus 1/I`

B

`Delta l Versus I^2`

C

`Delta l Versus 1/I^2`

D

`Delta l Versus l`

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