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in Physics by (25.0k points)
विभिन्न पदार्थो की दो छड़ो की अनुप्रस्थ-काटों के क्षेत्रफलों का अनुपात 1 : 2 तथा पदार्थो की ऊष्मा-चालकताओ का अनुपात 4 :3 है।इन छड़ो के सिरों के बीच तापांतर एकसमान रखने में छड़ो में ऊष्मा-चालन की दरें समान रहती है।छड़ो की लम्बाइयों का अनुपात ज्ञात कीजिए।

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