Two charges of \( + 1 \mu c \quad\text{and}\quad - 1 \mu c \) 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? \( \left [ K = 9 × 10^{9} N \frac{m^{2}}{c^{2}} \right ] \)

A 36.8 KN

B 28.4 KN

C \( 1.837 \times 10^5 \text{ N/C} \)