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एक वोल्ट्मीटर का प्रतिरोध `120 Omega` है । यदि इसे 9 वाल्ट तथा 15 ओम आंतरिक प्रतिरोध वाली बैटरी से जोड़ दिया जाये वोल्ट्मीटर का पाठ्यांक ज्ञात कीजिये ।

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दिया है `R = 120 Omega , r = 15 Omega , epsilon =9` वोल्ट V=?
सूत्र `r=R(epsilon/V-1)` में मान रखने पर,
` 15 = 120 (9/V-1)`
` 9/V -1 = 15/120`
या `9/V = 9/8 rArr V = 8`

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