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3 वोल्ट की एक बैटरी जिसका आंतरिक प्रतिरोध 1 ओम है एक विसर्पी ( slide ) तार से जोड़ी गई है जिसकी लम्बाई 100 सेमी व प्रतिरोध 5 ओम है । एक वोल्टमीटर जो नगण्य धारा लेता है , तार की 60 सेमी लम्बाई के बीच जोड़ा गया है । (i) वोल्टमीटर का पाठ्यांक क्या है ? (ii) यदि वोल्टमीटर का प्रतिरोध 150 ओम होता , तो उसका पाठ्यांक क्या होता ?

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(i) `1.5` वोल्ट , (ii)`1.485` वोल्ट ।

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