Fizika - 2019. jesen, 10.

A. $F=k \cdot \frac{Q^{2}}{a^{2}}$

B. $F=k \cdot \frac{Q^{2} \sqrt{3}}{a^{2}}$

C. $F=2 k \cdot \frac{Q^{2} \sqrt{3}}{a^{2}}$

D. $F=2 k \cdot \frac{Q^{2}}{a^{2}}$