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प्रश्न
Find out the amount of the work done to separate the charges at infinite distance.
उत्तर
The amount work done to separate the charges at infinity will be equal to potential energy.
Potential energy of the system U = `U_(q.2q) + U_(q-4q) + U_(2q-4q)`
`U = (kq(2q))/l + (kq(-4q))/l + (k2q(-4q))/l = (-10kq^2)/l`
Thus work done to seperate them to infinity W = U = `(-10kq^2)/l`
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