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यदि`._(6)C_(12)` के दो नाभिक एक-दूसरे को स्पर्श करें, तो इस निकाय की वैद्युत स्थितिज ऊर्जा की गणना कीजिए।

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`._(6)C_(12)` के नाभिक की त्रिज्या
`R=R_(0)A^(1//3)=1/2xx10^(-15)xx(12)^(1//3)`
`=2.75xx10^(-15)` मीटर
यदि दो नाभिक एक दूसरे को स्पर्श करें तो इनके केंन्द्रों के बीच की दूरी
`r=2R=5.50xx10^(-15)` मीटर
नाभिकों पर आवेश `q_(1)=q_(2)=6xx1.6xx10^(-19)` जूल
अतः निकाय की वैद्युत स्थितिज ऊर्जा
`U=1/(4pi epsilon_(0))(q_(1)q_(2))/r`
`=((9xx10^(9))xx(6xx1.6xx10^(-19))xx(6xx1.6xx10^(-19)))/(5.50xx10^(-15))`
`=1.51xx10^(-12)` जूल
`=(1.51xx10^(-12))/(1.6xx10^(-13))MeV=9.4MeV`

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