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आंतरिक प्रतिरोध r तथा विधुत-वाहक बल `epsi ` के एक सेल द्वारा बाह्य प्रतिरोध R से विधुत-धारा I प्रवाहित होती है।
A. सेल द्वारा प्रदान की गई शक्ति (power)`=epsil`
B. प्रतिरोधक R में ऊष्मा उत्पत्ति की दर `=epsil`
C. प्रतिरोधक R में उत्पत्ति की दर
D. सेल में ऊष्मा उत्पत्ति की दर `epsil((r)/(R+r))`

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