Four identical positive point charges are fixed at the four corners of a square of side

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential

Problem

Four identical positive point charges

+q

are fixed at the four corners of a square of side

a

. What is the magnitude of the electric field at the centre of the square? (a)

2\sqrt{2}\dfrac{kq}{a^{2}}

(b) 0 (c)

8\dfrac{kq}{a^{2}}

(d)

4\dfrac{kq}{a^{2}}