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A fixed volume of iron is drawn into a w...

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

A

`(1)/(L)`

B

`L^(2)`

C

`L`

D

`(1)/(L^(2))`

Text Solution

Verified by Experts

The correct Answer is:
B
The volume of the wire V=AL
`becauseY=(MgL)/(pir^(2)(DeltaL))=(FL)/(Ax)`
`thereforeX=(FL)/(AY)=(FL^(2))/((AL)Y)=(FL^(2))/(VY)`
`because`F, V and Y are constant
`therefore` The extensionn `xpropL^(2)`
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