Test: High School Physics

1.

A point charge of +Q is placed at the center of a square.  When a second point charge of -Q is placed at one of the square’s corners it is observed that an electrostatic force of 4N acts on the positive charge at the square’s center.  Now, identical charges of -Q are placed at the other three corners of the square.  What is the magnitude of the net electrostatic force acting on the positive charge at the center of the square?

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