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Copper of fixed volume ‘V; is drawn into wire of length ‘l’. When this wire is subjected to a constant force ‘F’, the extension produced in the wi re is ‘∆l’. Which of the following graphs is a straight line?
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- ∆l versus l/I
- ∆l versus l²
- ∆l versus I/l²
- ∆l versus l
Correct Option: B
| As Y = | ⇒ Δ l = | ||
| A | |||
| AY | |||
| l | |||
| But V = Al so A = | ||
| l |
| Therefore ∆l = | ∝ l² | |
| VY |
Hence graph of ∆l versus l2 will give a straight line.
