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समान लम्बाई व समान व्यास के नाईक्रोम तथा ताँबे के तारों को नियत विभवान्तर वाले दो बिंदुओं के बीच बारी - बारी से जोड़ा जाता है । कौन - से तार में ऊष्मा अधिक दर से उत्पन्न होगी ?
नाईक्रोम का विशिष्ट प्रतिरोध ताँबे से अधिक होता है तथा `P=V^(2)//R`.

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ताँबे के तार में ।

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