If All the Charges Are 15 Cm from the Origin $\mu$

Multiple Choice

If all the charges are 15 cm from the origin (the crossing point of the vertical and horizontal lines) in the above figure and Q = +3.0 $\mu$ C, then calculate the magnitude of the net force on a charge of +Q placed at the origin.

A) 22.8 N
B) 10.2 N
C) 26.0 N
D) 187 N
E) none of the above