The resistance of the wire is R 1 . It is now stretched (keeping the volume constant) without breaking so that its length becomes three times. Now the resistance becomes R 2 , then what is the value of R 2 : R 1 ?
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(9)
For a given wire, its resistance
The wire is stretched such that 
But density is unchanged.
Now, 
From ( 
) and ( 
)
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