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A fixed volume of iron is drawn into a wire of length l. The extension produced in this wire by a constant force F is proportional to -

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a

$\frac{1}{l^{2}}$

b

$\frac{1}{l}$

c

$l^{2}$

d

$l$

answer is C.

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Detailed Solution

when volume const

$e α l^{2}$ $e = \frac{F L}{A Y} \times \frac{L}{L}$ $e = \frac{F l^{2}}{V Y}$

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A fixed volume of iron is drawn into a wire of length l. The extension produced in this wire by a constant force F is proportional to -