Two charges of $+1\ C$ and $-1\ C$ are placed at the corners of the base of an equilateral triangle. The length of a side of the triangle is $0.7\ m$ . Find the electric field intensity at the apex of the triangle. $\left[k=9 \times 10^{9} \mathrm{Nm}^{2} / \mathrm{c}^{2}\right]$

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