Physics · JEE | Electric Charges and Fields

Referring to the system of charges at the vertices of an equilateral triangle of side \( l \) with charges \( q, q, -q \) as shown in Figure 1.7, what is the magnitude of the total force on the charge \( -q \) placed at vertex C?

1. A
   \( \frac{\sqrt{3}}{4\pi\varepsilon_0} \frac{q^2}{l^2} \)
2. B
   \( \frac{1}{4\pi\varepsilon_0} \frac{q^2}{l^2} \)
3. C
   \( \frac{2}{4\pi\varepsilon_0} \frac{q^2}{l^2} \)
4. D
   \( \frac{\sqrt{2}}{4\pi\varepsilon_0} \frac{q^2}{l^2} \)