Field Intensity at Point X with A(q+) and B(q-): Solve the Question

[Suzukigold]

A point X is located equidistant from point A (q+) and B (q-) in a parallel plane.

If the field intensity of A(q+) at point X is E, then what would the new field intensity be if point B (Q-) is added?

A) 2E
B) 0
C) 1/2E
D) 3/4 E

I assumed the answer is 2E, since the field of the positive charge (A) plus the field of the negative charge (B) are combined, however, my friend says it's B and I'm not sure anymore. Please, help?

 

[tiny-tim]

A point X is located equidistant from point A (q+) and B (q-) in a parallel plane.

If the field intensity of A(q+) at point X is E, then what would the new field intensity be if point B (Q-) is added?
…
I assumed the answer is 2E, since the field of the positive charge (A) plus the field of the negative charge (B) are combined …

Hi Suzukigold!

What do you mean by a parallel plane?

Any three points are in a plane.

Anyway, electric force is a vector field, so it obeys the law of vector addition, so you can't just add as if they were numbers.