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वैघृत क्षेत्र में बिंदुओं A तथा B पर वैघृत विभव क्रमश: 10 वोल्ट व -20 वोल्ट है। एकांकी इलेक्ट्रान को बिंदु A से B तक लाने में- (i ) बाह्म बल, (ii )वैघृत बल द्वारा कितना कार्य किया जायेगा?

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प्रश्नानुसार, `V_(A)=10` वोल्ट, `V_(B)=-20` वोल्ट, `q_(0)=-e =-1.6 xx 10^(-19)` कुलोम
(ii) वैघृत बल द्वारा कृत कार्य,
`(W_(A to B))` वैघृत बल `=q_(0)(V_(A)-V_(B))=-(W_(A to B))` बाह्म बल
`=-4.8 xx 10^(-18)` जूल

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