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  4. When the resistance wire is passed through a die the cross-section area decreases by 1 % , the change in resistance of the wire is

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Q. When the resistance wire is passed through a die the cross-section area decreases by $1\%$ , the change in resistance of the wire is

NTA AbhyasNTA Abhyas 2020Current Electricity

Solution:

Resistance of a wire is
$R=\frac{ρl}{A}$
$\frac{ΔR}{R}=\frac{Δl}{l}-\frac{ΔA}{A}=1-\left(- 1\right)=2\%$