FIGURE 21-16 -As Shown in Fig. 21-16, a Point Charge of +Q

question 74

Multiple Choice

FIGURE 21-16
-As shown in Fig. 21-16, a point charge of +Q is placed at the center of a square, and a second point charge of -Q is placed at the upper-left corner. It is observed that an electrostatic force of 2.0 N acts on the positive charge at the center. What is the magnitude of the force that acts on the center charge if a third charge of -Q is placed at the lower-left corner?

• A)zero
• B)2.0 N
• C)2.8 N
• D)4.0 N
• E)5.3 N

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