Four Point Charges Are Individually Brought from Infinity and Placed

question 48

Multiple Choice

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 magnitude of the electric field at P, the center of the square?

• A)kQ/a²
• B)2kQ/a²
• C)4kQ/a²
• D)kQ/4a²
• E)zero V/m

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