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बिंदु(0,0,-1) तथा (0,0,a) पर दो आवेश क्रमशः - q और +q स्थित है |
बिन्दुओ (0,0,z) और (x,y,0) पर स्थित विद्युत विभव की क्या है ?

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(i) बिंदु p पर विभव P (0 , 0,z) है |
` V = (1)/(4piin_(0)) [(q)/(z-a) - (q)/(z+a)]`
` = (1)/(4piin_(0)) (2a.q)/(z^(2) - a^(2)) `
image
` therefore V = (1)/(4piin_(0)) (P)/(z^(2) - a^(2)), therefore (because p = =2 a.q)`
(ii) बिंदु (x,y,0), Z-अक्ष के अभिलम्बवत है अतः (x ,y,0) पर विभव शुन्य होगा |

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