If a wire is stretched to make it $0.1 \%$ longer, its resistance will
AIEEE 2011, Easy
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Resistance of wire
$R=\frac{\rho l}{A}=\frac{\rho l^{2}}{C}(\text { where } A l=C)$
$\therefore $ Fractional change in resistance
$\frac{\Delta R}{R}=2 \frac{\Delta l}{l}$
$\therefore $ Resistance will increase by $0.2 \%$
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