When a Single Charge Q Is Placed at One Corner

Multiple Choice

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

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