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`3muC` का एक बिंदु आवेश `X-Y` निर्देश तंत्र के मूल बिंदु पर स्थित है। बिंदु A(5a,0) तथा बिंदु `B(-3a,4a)` के मध्य विभवांतर ज्ञात कीजिये।

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मूल बिंदु से बिंदु A `(5a,0)` की दुरी
`r_(A) = sqrt((5a-0)^(2)+(0-0)^(2)) = sqrt(25a^(2)) = 5a`
मूल बिंदु से बिंदु `B(-3a,4a)` की दुरी
`r_(B)=sqrt((-3a-0)^(2)+(4a-0)^(2))`
`=sqrt(9a^(2)+16a^(2))=sqrt(25a^(2))=5a`
अतः A पर विभव `V_(A) = 1/(4piepsilon_(0))q/r_(A)=1/(4piepsilon_(0))q/(5a)`
B पर विभव `V_(B) =1/(4piepsilon_(0))q/r_(B)=1/(4piepsilon_(0))q/(5a)`
`V_(A)=V_(B)`
`therefore V_(A)-V_(B)=0` वोल्ट

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