One Point Charge $+ Q$ Is Placed at the Center of a Square, and a of a Square

question 70

Multiple Choice

One point charge $+ Q$ is placed at the center of a square, and a second point charge $- Q$ is placed at the upper-left corner of the square. It is observed that an electrostatic force of magnitude $2.0 \mathrm {~N}$ acts on the positive charge at the center. Now a third charge $- Q$ is placed at the lower-left corner of the square, as shown in the figure. What is the magnitude of the net force that acts on the center charge now?

• A) \(4.0 \mathrm {~N}\)
• B) \(0.0 \mathrm {~N}\)
• C) \(5.3 \mathrm {~N}\)
• D) \(2.8 \mathrm {~N}\)

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