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a) $\dfrac{\sqrt{3}kQ}{l^2} \textrm{ , } 60^\circ \textrm{ below the negative x-axis}$

b) $\dfrac{kQ}{l^2} \textrm{ , } 30^\circ \textrm{ below the positive x-axis}$

Giancoli 6th Edition, Chapter 16, Problem 37

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Chapter 16, Problem 37 is solved.

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