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एक सेल द्वारा बारी - बारी से प्रतिरोध `R_(1)` में तथा प्रतिरोध `R_(2)` में समान समयों के लिए वैधुत धारा भेजने पर दोनों तारों में समान ऊष्मा क्षय होती है । सेल का आंतरिक प्रतिरोध क्या है ?

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Correct Answer - `r = sqrt(R_(1) R_(2))`.
माना सेल का विधुत वाहक बल E तथा आंतरिक प्रतिरोध r है । तब दोनों तारों में उत्पन्न उष्मा
`(E/(R_(1)+r))^(2) R_(1) t = (E/(R_(2)+r))^(2) R_(2) t`.

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