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किसी कार की संचायक बैटरी का विद्युत वाहक बल 12 V है। यदि बैटरी को आन्तरिक प्रतिरोध 0.4 Ω हो तो बैटरी से ली जाने वाली अधिकतम धारा का मान क्या है?

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E वैद्युत वाहक बल वाली बैटरी से ली जाने वाली धारा,

I = E/R + r

जिसमें R बाह्य प्रतिरोध तथा r आन्तरिक प्रतिरोध है। 

अधिकतम धारा के लिए बाह्य प्रतिरोध, R = 0

धारा, I = E/r = 12/0.4 = 30 A

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