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1. Due conduttori filiformi (uno in rame l'altro in alluminio) presentano la stessa sezione da 25 mm° e la stessa lunghezza di 50 m. Alla temperatura di 0°C entrambi
sono percorsi da una densità di corrente J = 1,5 A/ mm?, quale dei due dissipa la
potenza maggiore? Quanto vale P?

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