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धातुओं में मुक्त इलेक्ट्रॉनों के अनुगमन वेग तथा श्रान्तिकाल में क्या सम्बन्ध है ?

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धातुओं में मुक्त इलेक्ट्रॉनों के अनुगमन वेग तथा श्रान्तिकाल में क्या सम्बन्ध है ?
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अनुगमन वेग , `v_(d)=((eV)/(ml))tau`, जहाँ `tau ` श्रान्तिकाल है , m इलेक्ट्रॉन का द्रव्यमान है , l धात्विक तार की लम्बाई है , तथा V तार के सिरों के बीच विभवान्तर है ।
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