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विभवमापी में ताम्बे के तार का उपयोग नहीं किया जाता है , क्यों ?

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विभवमापी में ताम्बे के तार का उपयोग नहीं किया जाता , इसके निम्न कारण है -
(i) ताम्बे कि प्रतिरोधकता बहुत कम होती है । ,
(ii) ताम्बे का प्रतिरोध ताप - गुणांक उच्च होता है ।

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