Physics

Problem

Two identical point charges of magnitude

+q

are fixed on the x-axis at

x=-\tfrac{d}{2}

and

x=+\tfrac{d}{2}

. What is the net electric field at the origin? a)

\dfrac{8kq}{d^{2}},\ \text{toward the }+x\text{-axis}

\dfrac{2kq}{d^{2}},\ \text{toward the }+x\text{-axis}

c) Zero, because the fields are equal in magnitude and opposite in direction. d)

\dfrac{kq}{d^{2}},\ \text{toward the }+y\text{-axis}