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A constant voltage is applied between two ends of a uniform conducting wire. If both the length and radius of the wire is doubled then what happens to the heat produced in the wire? |
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Answer» We know that resistance of a conducting wire is R = \(\frac{pl}{A}\) = \(\frac{Pl}{πr^2}\) If length l and radius r are doubled, then resistance will become half. But heat produced H = \(\frac{V^2}{R}.\) Hence, heat produced per second will become thrice. |
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