Three equal charges are placed on the three corners of a square. If the force between `q_(1)` and `q_(2)` is `F_(12)` and that between `q_(1)` and `q_(3)` is `F_(13)`, then the ratio of magnitudes `(F_(12)//F_(13))` is
A. `1//2`
B. 2
C. `1//sqrt2`
D. `sqrt2`