Four point charges are individually brought from infinity and placed at the corners of a square as shown in the figure. Each charge has the identical value +Q. The length of the diagonal of the square is 2a. 
-What is the electric potential at P, the center of the square?
A) kQ/a
B) 2kQ/a
C) 4kQ/a
D) kQ/4a
E) zero volts
Correct Answer:
Verified
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