Electric potential energy:
The charge 2q is initially at rest while in the system. At a large distance, the potential energy of charge 2q as part of the system is zero. From the conservation of energy:
U0 + KE0 = Uf + KEf
The potential energy of charge 2q in the system = U0
Uf = 0
KE0 = 0
Four point charges form a square with sides of length d, as shown in the figure. In the questions that follow, use the constant k in place of .
What would be the kinetic energy K2q of charge 2q at a very large distance from the other changes?
Express your answer in terms of q, d, and appropriate constants.
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