A wire \( 50 \mathrm{~cm} \) long and \( 1 \mathrm{~mm}^{2} \) in c...

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A wire \( 50 \mathrm{~cm} \) long and \( 1 \mathrm{~mm}^{2} \) in cross-section carries a current of \( 4 \mathrm{~A} \) when connected to a \( 2 \mathrm{~V} \) battery. The resistivity of the wire is
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