Three Positive and Equal Charges Q₁, Q₂, and Q₃ Are

Three positive and equal charges Q₁, Q₂, and Q₃ are at the corners of an equilateral triangle as shown. Point P is at the midpoint of the line between Q₁ and Q₃. The electric field at P is

A) zero.
B) not zero and is directed along the line from P to Q₃.
C) not zero and is directed along the line from P to Q₂.
D) not zero and is directed along the line from Q₁ to Q₂.
E) None of these is correct.