qa 9b, Figure 18.46 Four point charges qa , qb. 9c , and qd lie on the comers of a square and q is located at its center.
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Considering the figure shown, suppose that qa = qd and qb = qc . First show that q is in static equilibrium. (You may neglect the gravitational force.) Then discuss whether the equilibrium is stable or unstable, noting that this may depend on the signs of the charges and the direction of displacement of q from the center of the square.
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