When a Single Charge Q Is Placed on One Corner

Multiple Choice

When a single charge q is placed on one corner of a square,the electric field at the center of the square is F/q.If three other equal charges are placed on the other corners,the electric field at the center of the square due to these four equal charges is

A) F/q.
B) 4F/q.
C) F/(2q) .
D) F/(4q) .
E) None of the above choices are correct.