$\begin{array}{1 1}(a)\;4 \sqrt{2}\;\large\frac{k\;q}{a^2}\qquad(b)\;2 \sqrt{2}\;\large\frac{k\;q}{a^2}\qquad(c)\; \sqrt{2}\;\large\frac{k\;q}{a^2}\qquad(d)\;\large\frac{k\;q}{a^2}\end{array}$

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