QJEEM11Ph3570: JEE Main 2011 Physics - Class 12 JEEM11Ph3570 Solution: If a wire is stretched to make it 0.1 % longer, its resistance…

Question

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If a wire is stretched to make it

0.1 %

longer, its resistance will:

Accepted Answer

Resistance of wire

R = \frac{ρ l}{A} = \frac{ρ l^{2}}{C}

(where

A l = C

)

∴

Fractional charge in resistance

\frac{Δ R}{R} = 2 \frac{Δ l}{l}

∴

Resistance will increase by

0.2 %

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