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विधुत वाहक बल E तथा आंतरिक प्रतिरोध r के सेल से किसी परिवर्ती प्रतिरोध R पर एक स्थिर वोल्टता मिले , इसके लिए प्रतिबंध ज्ञात कीजिए ।

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प्रतिरोध R के सिरों के बीच वोल्टता `V = I R`
सेल से वैधुत धारा `I = E/(R+r) `, जब r = 0 , तो ` I = E/R`
`:. V = E/R xx R = E`.
अतः जब आंतरिक प्रतिरोध r 0 , जब V = E.

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