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प्रश्न
Two point charges of 10C each are kept at a distance of 3m in the vacuum. Calculate their electrostatic potential energy.
उत्तर
`U = 1/(4piin_o) xx (q_1q_2)/a`
`= 9 xx 10^9 xx (10xx 10)/3`
`= 3 xx 10^11 J`
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