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Electrostatic Potential And Capacitance

Question

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Suggest an arrangement of three point charges separated by finite distances that has zero electric potential energy.

Solution

The arrangement of three point -q,+q and +q charges such that electrical potential energy is 0, is as shown below :

Electric potential energy, U = k \frac{q (q)}{r} + \frac{k (q) (- q)}{(2 r)} + \frac{k (- q) (q)}{(2 r)} U = zero .

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