When a voltage of \(20\) volt is applied between the two ends of a ...

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When a voltage of \(20\) volt is applied between the two ends of a coil, \( 800 \mathrm{cal} / \mathrm{s} \) heat is produced. The value of resistance of the coil is ________ (\(1\) calorie \( =4.2 \) joule )
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