The length a potentiometer wire is \( 1200 \mathrm{~cm} \) and it carries a current of \( 60 \ma...

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The length a potentiometer wire is \( 1200 \mathrm{~cm} \) and it carries a current of \( 60 \mathrm{~mA} \). For a cell of emf \( 5 \mathrm{~V} \) and internal resistance of \( 20 \Omega \), the null point of it is found to be at \( 1000 \mathrm{~cm} \). The resistance of whole wire is:
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