APFIVE Electric Potential Energy of Point Charges
Four identical point charges q are fixed at the corners of a square. If a fifth identical charge is moved from the center of the square to infinity, what is the change in the electric potential energy of the system?
A
-4kq²/d, where d is the side length of the square
B
Zero, as the system is in equilibrium
C
-4kq²/r, where r is the distance from center to corner
D
-2kq²/r, where r is the distance from center to corner
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