A copper wire is stretched to double its lenghth. What will be the effect on its specific resistance?
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no effect because it depend upon nature of substance
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When the length of the copper wire is doubled, the specific resistance of the copper wire will not be affected.
as we know, specific resistance is given as, ρ = m/ne²τ
where m is mass , n is number of electrons per unit volume, e is charge on electron and τ is time of relaxation.
here it is clearly shown that specific resistance doesn't depend on length of wire. so, if length of wire is doubled, specific resistance won't be affected.
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